如图1,△ABC中,CD⊥AB于D,且AD:BD:CD=2:3:4,
(1)试说明△ABC是等腰三角形;
(2)已知S△ABC=160cm2,如图2,动点M从点A出发以每秒2cm的速度沿线段AB向点B运动,同时动点N从点B出发以相同速度沿线段BC向点C运动,当其中一点到达终点时整个运动都停止.设点M运动的时间为t(秒),①若△DMN的边与AC平行,求t的值;
②若点E是边BC的中点,问在点M运动的过程中,△MDE能否成为等腰三角形?若能,求出t的值;若不能,请说明理由.
(1)试说明△ABC是等腰三角形;
(2)已知S△ABC=160cm2,如图2,动点M从点A出发以每秒2cm的速度沿线段AB向点B运动,同时动点N从点B出发以相同速度沿线段BC向点C运动,当其中一点到达终点时整个运动都停止.设点M运动的时间为t(秒),①若△DMN的边与AC平行,求t的值;
②若点E是边BC的中点,问在点M运动的过程中,△MDE能否成为等腰三角形?若能,求出t的值;若不能,请说明理由.
![](https://img.xkw.com/dksih/QBM/2021/11/7/2846056694579200/2846296542404608/STEM/86121042-ab30-442b-88f1-b74496d90892.png)
21-22八年级上·江苏苏州·期中 查看更多[3]
江苏省苏州市苏州工业园区星海实验中学2021-2022学年八年级上学期期中数学试题江苏省苏州工业园区星海实验中学2021-2022学年八年级上学期期中数学试题(已下线)期中难点特训(一)勾股定理与等腰(边)结合的压轴题-【微专题】2022-2023学年八年级数学上册常考点微专题提分精练(苏科版)
更新时间:2021-11-07 19:08:03
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【推荐1】用“☆”定义一种新运算:对于任意有理数a和b,规定a☆b=ab2+2ab+a,如:1☆3=1×32+2×1×3+1=16.
(1)求(﹣2)☆5的值;
(2)若(
☆3)☆(﹣
)=8,求a的值;
(3)若2☆x=m,(
x)☆3=n(其中x为有理数),试比较大小m,n的大小.
(1)求(﹣2)☆5的值;
(2)若(
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/068a664c5e22770daa6564ded5d80fd3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
(3)若2☆x=m,(
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56d266a04f3dc7483eddbc26c5e487db.png)
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【推荐2】定义:若
,则称
与
是关于
的关联数.例如:若
,则称
与
是关于2的关联数.
(1)若4与
是关于7的关联数,求
的值;
(2)若
与
是关于6的关联数,求
的值;
(3)若
与
是关于
的关联数,
,
的值与
无关,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a1a2f7c3f3da63ca2c0fd36938ca78d8.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/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/537840b5d75e1ece72d02adab38cfbaf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
(1)若4与
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33cd71ad57b7bd04c3fa74bd963a8c1b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/28388a72abd9094cbf44e217194c96b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(3)若
![](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/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77e8d3dcdb61dab48a4c2af2b2604a3f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
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【推荐3】某服装城共购入了两批A、B两款袜子.第一批购入A、B两款袜子共2500双,A款袜子售价为每双16元,B款袜子售价为每双24元,全部售出后的销售总额为52000元.服装城把2500双袜子全部售出后马上购入第二批袜子已知第二批袜子中,A款袜子的进货量比第一批减少了
双,售价不变;B款袜子的进货量比第一批减少了
,售价比原售价降低了
,两批袜子全部售出后的销售总额为94040元.
(1)服装城第一批购入的A、B两款袜子各多少双?
(2)该服装城第二批购进A款袜子多少双?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fad491e5b5e14c49ef8b7004ebcfcef9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba9f32952f55f28fea3af6075f6da25a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e6486784415f3537c9a13556c05d893.png)
(1)服装城第一批购入的A、B两款袜子各多少双?
(2)该服装城第二批购进A款袜子多少双?
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【推荐1】如图,在
中,
是它的角平分线,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/26/e6a9acfc-f252-4599-940c-fde8cf8ffc0a.png?resizew=164)
(1)求
的值;
(2)求证:
;
(3)求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99c30ca27204ac1c8b7a96d4734a5c36.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/26/e6a9acfc-f252-4599-940c-fde8cf8ffc0a.png?resizew=164)
(1)求
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(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a02bad7fac070822f4c8b4f8b64bda72.png)
(3)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
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【推荐2】如图,在△ABC中,AD,AE分别是边BC上的中线和高,若AE=3cm,S△ABC=12cm2,求DC的长.
![](https://img.xkw.com/dksih/QBM/2018/9/27/2041508338270208/2043395277783040/STEM/f17e756436974fb18a3f958dfea394ae.png?resizew=158)
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【推荐1】已知一次函数
的图象与坐标轴交于A,B两点,AE平分∠BAO,交x轴于点E.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/12/49ddc9fb-538a-4a17-957e-4510b4ddfed9.png?resizew=192)
(1)直接写出点A和点B的坐标;
(2)求点E的坐标;
(3)过点B作BF⊥AE,垂足为F,连接OF,
①判断△OFB的形状并说明理由;
②求△OFB的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2107c297f7a5a8f147c889a92b136a3c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/12/49ddc9fb-538a-4a17-957e-4510b4ddfed9.png?resizew=192)
(1)直接写出点A和点B的坐标;
(2)求点E的坐标;
(3)过点B作BF⊥AE,垂足为F,连接OF,
①判断△OFB的形状并说明理由;
②求△OFB的面积.
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【推荐2】如图,
是
的直径,
是
的弦,
,垂足为
,
为
上一点,且
,连接
交
于点
,连接
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/31/7f44ca28-cbfe-48ff-aeea-70dfe7cdb10c.png?resizew=158)
(1)求证:
;
(2)若
,
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
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![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/31/7f44ca28-cbfe-48ff-aeea-70dfe7cdb10c.png?resizew=158)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fba15c10d43122cbbaf1227998611d4.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d958f5219b501284e1554d9a8aec3a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f42f56b246c0eecf454c6ca8f956fb04.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2273ae1ee99cec9c1304323bc9ebf75f.png)
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【推荐1】如图,已知在Rt△ABC中,∠ACB=90°,AC=8,BC=16,D是AC上的一点,CD=3.点P从B点出发沿射线BC方向以每秒2个单位的速度向右运动.设点P的运动时间为.连接AP
![](https://img.xkw.com/dksih/QBM/2022/1/22/2899952677683200/2900251039145984/STEM/4a864499-428e-47ad-aa3a-ddc7891b1bc1.png?resizew=267)
(1)当t=3秒时,求AP的长度(结果保留根号);
(2)当点P在线段AB的垂直平分线上时,求t的值;
(3)过点D作DE⊥AP于点E.在点P的运动过程中,当t为何值时,能使DE=CD?
![](https://img.xkw.com/dksih/QBM/2022/1/22/2899952677683200/2900251039145984/STEM/4a864499-428e-47ad-aa3a-ddc7891b1bc1.png?resizew=267)
(1)当t=3秒时,求AP的长度(结果保留根号);
(2)当点P在线段AB的垂直平分线上时,求t的值;
(3)过点D作DE⊥AP于点E.在点P的运动过程中,当t为何值时,能使DE=CD?
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【推荐2】如图1所示,在
中,
,点
是线段
延长线上一点,且
.点
是线段
上一点,连接
,以
为斜边作等腰
,连接
,
满足条件
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/25/07518c63-7ed5-41c5-ad65-c1d96ac38908.png?resizew=353)
(1)若
,
,
,求
的长度;
(2)求证:
;
(3)如图
,点
是线段
延长线上一点,探究
、
、
之间的数量关系,并证明.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c513dca3b8c31bc8d0ed4301e94cc1e5.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1493c9f4a3b17fd4286867790cc204a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a679040c4d556723e482bacbab41356d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a679040c4d556723e482bacbab41356d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a5db5f24ccf3ad17748ca00a2cf7f9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8faa67131a39f719be1871606b7927c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8faa67131a39f719be1871606b7927c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6647ab4f8ee12b16a43915a2f59469a8.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/25/07518c63-7ed5-41c5-ad65-c1d96ac38908.png?resizew=353)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a88204117e6d33112c44915af43ca514.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/02167520d0dd76abddbd0b7bf8f5b623.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb3d814a5e87bf9969c779c306a27a81.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f17cf2d484f4db0fb3ba11819d045957.png)
(3)如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41ff8c8d239cc12ddc3a899e9f054aa9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9f79d7939c88e9702962e5917cad290.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79ff575e55857af133edb24c8e61504f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
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