如图①,在△ABD中;∠A=60°,AD=2AB=4cm,将△ABD绕BD中点O旋转180°得到△CDB,点E是AD的中点,点P从点A出发,沿折线A→B→C以1cm/s的速度向终点C运动,连接PE,设运动时间为t(s).
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/21/8c48f4e0-98f7-4737-ad8d-9492a12765b3.png?resizew=475)
(1)BC= ;
(2)用含有t的代数式表示PB的长;
(3)当PE将四边形ABCD的周长分成2∶3两部分时,求t的值;
(4)如图②.在点P运动过程中,作点A关于直线PE的对称点
,连接
.当
所在直线与四边形ABCD的边垂直时,请直接写出∠AEP的度数.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/21/8c48f4e0-98f7-4737-ad8d-9492a12765b3.png?resizew=475)
(1)BC= ;
(2)用含有t的代数式表示PB的长;
(3)当PE将四边形ABCD的周长分成2∶3两部分时,求t的值;
(4)如图②.在点P运动过程中,作点A关于直线PE的对称点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2684b10100be43f77a13fa0ccd1c1d72.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f02f0a90d3a34d0bf56ff9651c05af0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f02f0a90d3a34d0bf56ff9651c05af0.png)
22-23八年级上·吉林长春·阶段练习 查看更多[2]
吉林省长春市南关区新解放学校2022-2023学年八年级上学期9月月考数学试题(已下线)专题05 图形与图形的变换(5大易错点分析+21个易错点+易错题通关)-备战2024年中考数学考试易错题(江苏专用)
更新时间:2022-09-19 17:26:44
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【推荐1】某人到泉州市移动通讯营业厅办理手机通话业务,营业员给他提供了两种办理方式,甲方案:月租9元,每分钟通话费0.2元;乙方案:月租0元,每分钟通话费0.3元.
(1)若此人每月平均通话x分钟,则两种方式的收费各是多少元?(用含x的代数式表示)
(2)此人每月平均通话10小时,选择哪种方式比较合算?试说明理由.
(1)若此人每月平均通话x分钟,则两种方式的收费各是多少元?(用含x的代数式表示)
(2)此人每月平均通话10小时,选择哪种方式比较合算?试说明理由.
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【推荐2】某家具厂生产一种课桌和椅子,课桌每张定价200 元,椅子每把定价80元,厂方在开展促销活动期间,向客户提供两种优惠方案:方案一:每买一张课桌就赠送一把椅子;方案二:课桌和椅子都按定价的80%付款.某校计划添置100张课桌和x把椅子.
(1)若x>100,请用含x的代数式分别把两种方案的费用表示出来;
(2)若x=300,如果两种方案可以同时使用,作为一种新的方案,请帮助学校设计一种最省钱的方案
(1)若x>100,请用含x的代数式分别把两种方案的费用表示出来;
(2)若x=300,如果两种方案可以同时使用,作为一种新的方案,请帮助学校设计一种最省钱的方案
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【推荐3】已知数轴上有A、B、C三个点,分别表示有理数
,动点P从A出发,以每秒1个单位的速度向点C移动(到达C点停止运动),设移动时间为t秒.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/7/35ccaeec-06ab-4f93-b7d0-21b1e080ae4b.png?resizew=205)
(1)用含t的代数式表示P到点A和点C的距离(其中PA表示点P到点A的距离,PC表示点P到点C的距离):
,
;
(2)当点P运动到B点时,点Q从A点出发,以每秒2个单位的速度向C点运动,Q点到达C点后Q点停止运动.在点Q开始运动到P,Q都停止,P、Q两点之间的距离能否为2个单位?如果能,请求出此时点P表示的数;如果不能,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03c99a7705afdc668886866b8b595c7a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/7/35ccaeec-06ab-4f93-b7d0-21b1e080ae4b.png?resizew=205)
(1)用含t的代数式表示P到点A和点C的距离(其中PA表示点P到点A的距离,PC表示点P到点C的距离):
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5745e2dc1d5308872c68ae932cd13ffa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33e7d551cca653e2d638c8cab4c2fda8.png)
(2)当点P运动到B点时,点Q从A点出发,以每秒2个单位的速度向C点运动,Q点到达C点后Q点停止运动.在点Q开始运动到P,Q都停止,P、Q两点之间的距离能否为2个单位?如果能,请求出此时点P表示的数;如果不能,请说明理由.
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【推荐1】如图,在长方形
中,
,
.动点
从
出发,每秒1个单位长度的速度沿
匀速运动,到
点停止运动;同时点
从
点出发,以每秒2个单位长度的速度沿
匀速运动,到
点停止运动.设
点运动的时间为
秒
.
![](https://img.xkw.com/dksih/QBM/2020/12/22/2626628352188416/2631541342912512/STEM/04b3ce86-fb6f-4009-aa09-53a5e6bac5d4.png?resizew=304)
(1)点
在
上运动时,
______,
______,点
在
上运动时,
______,
______(用含
的代数式表示);
(2)求当
为何值时,
;
(3)当
,
两点在运动路线上相距3个单位长度时,请直接写出
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06ff2e2780c282e8ab8e5e88681e1efc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d05ec61eae7478f1b9f3c6203f831a8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42acae4bf2a6bead9d904b70d0480fc0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7a6be08c747b22834f1425c6253eebc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a363df9127fb019f87ec53470c50dcc3.png)
![](https://img.xkw.com/dksih/QBM/2020/12/22/2626628352188416/2631541342912512/STEM/04b3ce86-fb6f-4009-aa09-53a5e6bac5d4.png?resizew=304)
(1)点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5745e2dc1d5308872c68ae932cd13ffa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d0f08eb47a5429245f4c162d0355a45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf757b473eb160e42173982184ac5b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9561d5e6e6db36833d480b3677036532.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
(2)求当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7341c7d3b742bf451457145206782711.png)
(3)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
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【推荐2】已知点A在数轴上对应的数为a,点B对应的数为b,且
,A、B之间的距离记作
,定义:
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/2/05a1c870-c575-4d01-9cfe-4d287581cb27.png?resizew=283)
(1)求线段AB的长
______;
(2)如图,点M,N,P是数轴上的三点,点M表示的数为4,点N表示的数为
,动点P表示的数为x.
①若点P在点M、N之间,则
______;
②若
,则
______;
③若点A,B分别从点M,N同时出发,点A以每秒1个单位长度的速度沿数轴向左匀速运动,点B以每秒2个单位长度的速度沿数轴向右匀速运动,设运动时间为t(
)秒.求t为何值时,点A与B相距3个单位长度?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/427b3dc14a8bb439d45da06a65f87ae2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f4dfec890cdfdda355e19463f3be813.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99b60a6e9515c220c8554719e399ec47.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/2/05a1c870-c575-4d01-9cfe-4d287581cb27.png?resizew=283)
(1)求线段AB的长
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88bee8e70f1fab639be1636c7bce0477.png)
(2)如图,点M,N,P是数轴上的三点,点M表示的数为4,点N表示的数为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acbc6a613224461ade69362d46550474.png)
①若点P在点M、N之间,则
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e093018d5ac8c8bee584b70c4fd8c629.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a4f08df1be8c8ef14d7f76d300dc69d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ec0618ae3a4fde6d6220010af229b9a.png)
③若点A,B分别从点M,N同时出发,点A以每秒1个单位长度的速度沿数轴向左匀速运动,点B以每秒2个单位长度的速度沿数轴向右匀速运动,设运动时间为t(
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fff6e7e2b9f2b68b1647f6350b98dc8.png)
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【推荐1】已知
,
,
,
为
上的一点.
![](https://img.xkw.com/dksih/QBM/2021/1/28/2645900707545088/2646566485999617/STEM/cb8a34ff-f891-4320-8fb8-20969046f716.png)
![](https://img.xkw.com/dksih/QBM/2021/1/28/2645900707545088/2646566485999617/STEM/c894b6c7-9dd9-4f3e-a892-4feb1f7bfa7c.png?resizew=225)
(1)如图1,若
,
,求
的长;
(2)如图2,过点
作
垂直
的平分线于点
,过点
作
交
的延长线于点
,连接
交
于点
,若
平分
,
.求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5138a9f70d5e8b0580e30fef6eb7baef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05d35d8d8bb0dc17f2f86fe5b230a2b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/650c6c818df102a83ce5159e3208d01a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://img.xkw.com/dksih/QBM/2021/1/28/2645900707545088/2646566485999617/STEM/cb8a34ff-f891-4320-8fb8-20969046f716.png)
![](https://img.xkw.com/dksih/QBM/2021/1/28/2645900707545088/2646566485999617/STEM/c894b6c7-9dd9-4f3e-a892-4feb1f7bfa7c.png?resizew=225)
(1)如图1,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0429144beed02061116993d1d6f10d23.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d8511eeface9029eeaeaf60ec2c722d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
(2)如图2,过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/907d5147cea4c9ce855074864fe54506.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91471da4a77df63164169d4858666563.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8e41916523511064a97de39b0f2b323.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2273ae1ee99cec9c1304323bc9ebf75f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e5c62f22d7afc5627fcb86599faa8e1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0573e4ac3ffa74064a17777ce7ffbcf1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c726e6761220da38a3f2f20bd60a91f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05e00851620016f8548970ef93ebd879.png)
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【推荐2】如图,在矩形
中,
,将线段
绕点A逆时针旋转
度
得到线段
,过点
作
的垂线交射线
于点
,交射线
于点
.
在
延长线上运动时,
与
始终相等,且
与
始终相似,请说明理由;
(2)[深入探究]若
,随着线段
的旋转,点
的位置也随之发生变化,当
时,求
的值;
(3)[拓展延伸]连接
,当
为等腰三角形时,求
的值(用含
的代数式表示).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f6759a981878dbedf3abdbed1cf0bec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/948375537bc44877c09fdcd64cd1d633.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.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/ac047e91852b91af639feec23a9598b2.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/060705794ef87cc71dac40c57f27b1d2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48ea8be9535f942121f6f6d873d03272.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21786fe6fbbd671ba5158f4a920b8884.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b620caad4623b952774f941cf4ca664.png)
(2)[深入探究]若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3a2a34b4317deffa40ba34e269c2b81.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/69a723c4429be134cbdbf50b35c67dcb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cc9750c313ee972124cb62c4a6fb7ea.png)
(3)[拓展延伸]连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21037e170bdbb322558e79c40c00b454.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc6ca93d868b56ce9e2f752ec264eabb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cc9750c313ee972124cb62c4a6fb7ea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
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解答题-问答题
|
较难
(0.4)
名校
【推荐1】已知:在
中,
,点
为线段
上一动点(不与
、
重合).
,
交
延长线于点
,当
,
时,
的面积为______;
(2)如图2,若
,
是
上的一点,且满足
,当
时,
交
于点
时,判断
与
的数量关系,并说明理由;
(3)如图3,若
,点
、
分别为
、
边上的动点,当
周长取最小值时,求
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](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/9c06154cae3bf7a8ce5a1e97a7380875.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b937442ad4cc480adc11bb143559454.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9abaeba15f3abdd877bc701af52c5cd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc11331a7b2d2619b40ee6d34c3bd620.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32f01c4faacedfe56f5127d6c0cc63cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/004104bafb5f30338123d4ea2b7fedde.png)
(2)如图2,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f81e24376a13d648c2ed0dc73bc710e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac61397614925057008cfb52daf423a8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b757f0c42ae5c9a2d6a4b19e5877b27.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
(3)如图3,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24ddf8472b3d120b8643d736f07cfb23.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/999c42a021bdc576f097246b9e64d986.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a54e7b35c73ee578c4d01479ddb74cc.png)
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