名校
1 . 已知:
是
直径, 四边形
内接于
,
.
)求证:
平分
;
(2)如图(
)
的角平分线交
于点
,求证:
;
(3)如图(
)在(
)问条件下,延长
到
,
,连接
, 连接
交
于点
,若
,
,求线段
长度.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae33911e41aa2f7004cc01e336f96bf0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ff29971ccc633d89832ffa9bd54afa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fabb884dc5f9609de491245463bbe9a.png)
(2)如图(
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c42b59b76eafbbe36f13b2daa60132c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36f11400237c043dc9822dde349513d5.png)
(3)如图(
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dea2ae9d515f9ab351ad72306b776ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e115e9b257b499036204cff6b76eb130.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/735056c174e8dd7906257a2a50a962a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00bab17635a999236e8d2e35017a208d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2cfcc2f19aa3ccf40fd8042eb683327.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24a6241af8eadb720f601ee48f74cb9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce8f887360a533f0a25b0b34fb11f0a1.png)
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2 . 数学活动课上,琳琳同学将一张长方形纸条
沿
折叠,点
落在点
处.
,她通过测量发现:
,请你证明她的结论;
(2)如图
,点
在
上,点
在
上,连接
,
,将四边形
沿
所在直线折叠得到
,
交
于
,点
的对应点落在点
处,点
的对应点落在点
处.她通过测量发现:
,请你证明她的结论.
(3)如图
,在(
)的条件下,将四边形
沿
向上折叠得到四边形
,点
的对应点恰好落到
上的点
处,点
落到点
处,猜想
,
与
的数量关系,并证明你的结论.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/473d018b2fdfa5f846a5014604ae0f23.png)
(2)如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c81a02387abc7ff6c90e2a4c5448603b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411c0c6f037b5fde15c21190b8540b3f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c0fbc3f04ea49bcd8817f9a1ad4cb4ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4aa0df7f1e45f9de29e802c7f19a4f64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49c5a908fc1ea3b90196a8c1c0d6143c.png)
(3)如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c0fbc3f04ea49bcd8817f9a1ad4cb4ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d2dce07491c3e53410375b50733fb7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b7abb2bc8c724bfd1f79c432b424f7f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d786ee723231d4ca87eb9d011a378b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57debff8a4c250694ef00deae0e61662.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/280c1e003bd7073887af6c7720662b48.png)
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3卷引用:黑龙江省哈尔滨市巴彦县华山乡中学2023-2024学年七年级下学期第三次月考数学试题
黑龙江省哈尔滨市巴彦县华山乡中学2023-2024学年七年级下学期第三次月考数学试题黑龙江省哈尔滨市宾县第四中学2023-2024学年七年级下学期第三次月考数学试题(已下线)暑假作业10 平行线的基本模型(知识梳理+5大题型+拓展突破)-【暑假分层作业】2024年七年级数学暑假培优练(苏科版)
3 . 甲、乙两人从
城出发到
城旅行,甲骑自行车,乙骑摩托车.如图表示甲、乙两人离开
城的路程与时间的关系,则下列结论正确的个数为( )
城到
城花了2个小时;②乙的速度为50千米/时;③甲在途中休息3小时;④甲前3小时走了60千米.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
A.1 | B.2 | C.3 | D.4 |
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4 . 为迎接亚冬会,区教育局组织骑行大赛,并为参赛的部分优秀学生选手购买骑行帽,按原价用计划的2400元可购买这种骑行帽若干个,商场老板决定给予八折优惠,结果教育局用这计划的2400元购买的骑行帽数量比按原价购买多4个.
(1)求这种骑行帽原价多少元一个.
(2)由于参赛同学增多,教育局准备再购买这种骑行帽和防霾口罩共200个,用于奖励参赛学生.骑行帽仍可按八折购买,防霾口罩进价10元/个,商场老板与教育局协商后将防霾口罩按利润率
的价格出售,若教育局用于再购买骑行帽和防霾口罩的钱数少于10000元,则教育局用这笔钱数最多可购买多少个骑行帽?
(1)求这种骑行帽原价多少元一个.
(2)由于参赛同学增多,教育局准备再购买这种骑行帽和防霾口罩共200个,用于奖励参赛学生.骑行帽仍可按八折购买,防霾口罩进价10元/个,商场老板与教育局协商后将防霾口罩按利润率
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c8ee628efd6b2f7296c106dd5cbae42f.png)
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5 . 端午节来临之际,哈市“隆兴”饰品商店准备购进A、B两种品牌的挂件进行销售,已知若购进A品牌的挂件2个,B品牌的挂件3个,共需90元,若购进A品牌的挂件4个,B品牌的挂件2个,共需100元.
(1)求A、B两种品牌的挂件每个各多少元?
(2)若该饰品店购进A、B两种品牌的挂件共100个,其中A品牌的挂件每个售价为25元,B品牌的挂件每个售价为35元,A品牌的挂件很快售完,B品牌的挂件最后有10个打八折销售,售完全部挂件该饰品店共获利1230元,求该饰品店A、B两种品牌的挂件分别购进多少个?
(1)求A、B两种品牌的挂件每个各多少元?
(2)若该饰品店购进A、B两种品牌的挂件共100个,其中A品牌的挂件每个售价为25元,B品牌的挂件每个售价为35元,A品牌的挂件很快售完,B品牌的挂件最后有10个打八折销售,售完全部挂件该饰品店共获利1230元,求该饰品店A、B两种品牌的挂件分别购进多少个?
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2卷引用:黑龙江省哈尔滨市巴彦县华山乡中学2023-2024学年七年级下学期第三次月考数学试题
6 . 某体育用品专卖店准备购进两种类型的羽毛球拍,每副A型羽毛球拍比B型羽毛球拍的进价少10元,用6000元购进A型羽毛球拍的副数是用3500元购进B型羽毛球拍副数的2倍.
(1)求
两种型号的羽毛球拍每副进价各是多少元;
(2)若该商场购进B型羽毛球拍的副数比A型羽毛球拍的2倍还多5副,且A型羽毛球拍不少于18副,购进
两种型号羽毛球拍的总费用不超过4350元,请你求出该商场有哪几种进货方案;
(3)若A型羽毛球拍售价为70元/副,B型羽毛球拍售价为85元/副,该商场在(2)中获得最大利润的条件下,为促进销售,商场推出每购买一副羽毛球拍可抽奖一次,中奖顾客赠送同款羽毛球一盒,
两款羽毛球的进价每盒分别是30元、35元.如果
两款羽毛球拍全部售出,除去奖品的费用后仍获利675元,那么
两款羽毛球共赠送多少盒?请直接写出答案.
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ae6f48b9a53c0155a692509cf31f7e6.png)
(2)若该商场购进B型羽毛球拍的副数比A型羽毛球拍的2倍还多5副,且A型羽毛球拍不少于18副,购进
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ae6f48b9a53c0155a692509cf31f7e6.png)
(3)若A型羽毛球拍售价为70元/副,B型羽毛球拍售价为85元/副,该商场在(2)中获得最大利润的条件下,为促进销售,商场推出每购买一副羽毛球拍可抽奖一次,中奖顾客赠送同款羽毛球一盒,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ae6f48b9a53c0155a692509cf31f7e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ae6f48b9a53c0155a692509cf31f7e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ae6f48b9a53c0155a692509cf31f7e6.png)
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7 . 如图,在平面直角坐标系中,已知
点与
点关于
轴对称,连接
.
解析式;
(2)如图2,已知点
在
的延长线上,连接
,设点
的横坐标为
的面积为
,试用含
的式子表示
;
(3)如图3,在(2)的条件下,过点
作
轴于点
,取
的中点
,连接
并延长交
轴于点
,作
交
于点
,连接
并延长交
轴于点
,交
的延长线于点
,作
,点
在
上,连接
并延长,交
轴于点
,求
点的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a0d9c6f7df4aa00c4231502eaa2de86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e675a92cad72c65aa4071b9d9e226090.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
(2)如图2,已知点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12b501ad4237801071c3608ea43fb3fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
(3)如图3,在(2)的条件下,过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59fbd9b5e5d8be69373850d7faebdaf1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c88d9142df6ba8e43c1a93bd04a1362.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8e41916523511064a97de39b0f2b323.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35d58f9019097bd05037aefd5c322916.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03e5be2a92b5101bf41b4b43022c74a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e9e953a4a5f98c96bbe67cbaadf76d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a95bbaefefcecc6a8b3780b2635ce28d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
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8 . 在综合实践课上,老师组织同学们以“图形的旋转”为主题开展数学活动.下面是同学们进行相关问题的研究.
【特例感知】如图①,正方形
中,点
在
边上,将
绕点
顺时针旋转得到
,旋转角等于
,连接
.作
,垂足为
,易知
与
的数量关系为________;若
,
,则
________;
【类比探究】如图②,矩形
中,
,
,点
在折线
上运动,将
绕点
顺时针旋转得到
,旋转角等于
,连接
.
(1)当点
在
上时,作
,垂足为
,猜想
与
的数量关系为________,请证明你的结论;
(2)当
时,
________;
(3)连接
,点
从点
运动到点
的过程中,
的最小值为________.
【特例感知】如图①,正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/721c75fcd58d3d54260aad0f82e09e37.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/790d5327d89fc1b3145e546482a46a6e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f4aca5534bce25acaeb7379deed8f8f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4bec7a394f93ab33971255f5bef35af5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81b1fce5acb99c537df69d9d66141305.png)
【类比探究】如图②,矩形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/305a88d4e0249bd16d48eda01331d2d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04ee826937d2add7a93aaa1422f8b736.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6be1de798d031b5142aff0af8ba2c3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/721c75fcd58d3d54260aad0f82e09e37.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
(1)当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/790d5327d89fc1b3145e546482a46a6e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb89a4a0c99a3ed9a193711a2126dba5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81b1fce5acb99c537df69d9d66141305.png)
(3)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
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9 . 如图,
是
的的直径,
和
是
的两条弦,且
,连接
交
于点K.
;
(2)如图2,若
交
于点L,求证:
;
(3)如图3,在(2)的条件下,连接
交
于点G,延长
至点F,连接
,
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b5f215a42c4b7078d8d65923eb9980e.png)
(2)如图2,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f913298f0fae9f55377a8deab9f099dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2344054d54463aa1730e180e182756a3.png)
(3)如图3,在(2)的条件下,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21037e170bdbb322558e79c40c00b454.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c0d2155efce9ab2fe5b6938480ab968e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0aad838c305c95e05ebc0f549a1826fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36feb638cf64a5de99817b2084b20cec.png)
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10 . 黑龙江省有大森林、大草原、大湿地、大湖泊、大冰雪,是我国北方重要生态安全屏障.全省森林面积
万平方公里,国家级自然保护区
个,均居全国前列.
年黑龙江空气质量优良天数比例达
,绿色成为高质量发展的亮丽底色.
万用科学记数法表示为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6ea7d0f28843fa5a0fd920f546736da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8f70f0c1b960fa850d67c4091e04400.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e946baf1316ac1f219398ecedadf6cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ae0962e0a89f151496fe5db1cb95a1a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6ea7d0f28843fa5a0fd920f546736da.png)
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