已知:如图,
,
,
,
.点P在线段
上,连接
,过点D作
的垂线,与
相交于点C.设线段
的长为x.
(1)当
时,求线段
的长;
(2)设
的面积为y,求y关于x的函数解析式,并写出函数的定义域;
(3)当
时,求线段
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/080db3af81b29ed10144a1c2e2a4fb8a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4adf90a8c2b29334cdc5aa5b554991f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efc6e4b936d7a800e839a30c3839574d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09d27bd71d79cb19eb554175e4ef0867.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/13/b1b8e508-b0cf-4afa-a234-ec1e40532574.png?resizew=311)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5bd50cf631e459b58b180cdf2f57844c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36aae82d53f2a35d2f95f467bd5b76cf.png)
(3)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eed86cdabb478f2995620adb997d1982.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
2023九年级上·全国·专题练习 查看更多[1]
(已下线)第4章 图形的相似全章复习攻略与检测卷(3个概念2个性质1个判定1个作图1个应用2种思想)-【帮课堂】2023-2024学年九年级数学上册同步学与练(北师大版)
更新时间:2023-10-06 14:35:55
|
相似题推荐
解答题-证明题
|
适中
(0.65)
【推荐1】完成下面的证明已知:如图,点D,E,F分别是三角形ABC的边BC,CA,AB上的点,DE//BA,DF//CA.
求证:∠A+∠B+∠C=180°.
证明:∵DE//BA,
∴∠3= ( ),
∠2= ( ).
∵DF//CA,
∴∠1= ( ),
∠BFD= ( ).
∴∠2= ( ).
∵∠1+∠2+∠3=180°(平角的定义),
∴∠A+∠B+∠C=180°(等量代换).
求证:∠A+∠B+∠C=180°.
证明:∵DE//BA,
∴∠3= ( ),
∠2= ( ).
∵DF//CA,
∴∠1= ( ),
∠BFD= ( ).
∴∠2= ( ).
∵∠1+∠2+∠3=180°(平角的定义),
∴∠A+∠B+∠C=180°(等量代换).
![](https://img.xkw.com/dksih/QBM/2022/1/28/2904034072616960/2904221267025920/STEM/7afb83c8c20f400484445f831984adef.png?resizew=212)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
【推荐2】在
中,
是
的角平分线.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/8/a49b2164-5281-4a32-9d55-3eb4d5baf03b.jpg?resizew=261)
(1)如图1,过C作
交
延长线于点E,若F为
的中点,连结
,求证:
;
(2)如图2,M为
的中点,过M作
交
于点N,若
,
,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/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/8/a49b2164-5281-4a32-9d55-3eb4d5baf03b.jpg?resizew=261)
(1)如图1,过C作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aec5d3a183594be47dd6e386d2c9d725.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dea2ae9d515f9ab351ad72306b776ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f345b28a81ff3d2c4666ee945a426fa9.png)
(2)如图2,M为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ff3c1ea812dbddf9c5752e45e3713a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f186ea827f7becafd1ac4955e22c6812.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2dafebaaf13781120dc57c277d0267c0.png)
您最近一年使用:0次
解答题-作图题
|
适中
(0.65)
【推荐1】如图,在
中,以点
为圆心,
长为半径画弧交
于点
,再分别以点
、
为圆心,大于
的相同长为半径画弧,两弧交于点
,连接
并延长交
于点
,连接
,则所得四边形
是菱形.
![](https://img.xkw.com/dksih/QBM/2020/5/13/2462067474489344/2462455710416896/STEM/854240f69bf4484f8d28c3d7fc7149e9.png?resizew=175)
(1)根据以上尺规作图的过程,求证:四边形
是菱形.
(2)若菱形
的周长为16,
,求菱形
的面积及
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5138a9f70d5e8b0580e30fef6eb7baef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/40fe477aea662f3ae9b6d28f1e785147.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2dde327febef2331a4766a79b433cc02.png)
![](https://img.xkw.com/dksih/QBM/2020/5/13/2462067474489344/2462455710416896/STEM/854240f69bf4484f8d28c3d7fc7149e9.png?resizew=175)
(1)根据以上尺规作图的过程,求证:四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2dde327febef2331a4766a79b433cc02.png)
(2)若菱形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2dde327febef2331a4766a79b433cc02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9100eadeba8de498bad6bc9189433d2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2dde327febef2331a4766a79b433cc02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/194741f4d2ae7ee44cafca780361446a.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
【推荐2】如图,△ABC中,∠ACB=90°,AC=7,BC=24,CD⊥AB于D.
(1)求AB的长;
(2)求CD的长.
(1)求AB的长;
(2)求CD的长.
![](https://img.xkw.com/dksih/QBM/2017/12/3/1830629461999616/1832103066861568/STEM/cf2bb5b988cd4494bc528d286a128542.png?resizew=183)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
【推荐1】如图,
是
的直径,
为
上一点,
为
的中点,
交
的延长线于点
.
(1)判断
与
的位置关系,并说明理由;
(2)若
,求
的半径.
![](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/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed41d321f4c0717ac5b443aad942d9a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68fbbd17c89f03dbb61cd6ffdb9a0344.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/4/4fffdc70-cc8c-48c0-8166-e4b1d97650f3.png?resizew=185)
(1)判断
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/573d337d9505c905e00266d95b37c4c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
您最近一年使用:0次
解答题-作图题
|
适中
(0.65)
真题
【推荐2】如图1,是某校教学楼正厅一角处摆放的“教学楼平面示意图”展板,数学学习小组想要测量此展板的最高点到地面的高度.他们绘制了图2所示的展板侧面的截面图,并测得
,
,
,
,底座四边形
为矩形,
.请帮助该数学学习小组求出展板最高点A到地面
的距离.(结果精确到
.参考数据:
,
)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d630596f58a832a8560b2c6bbc6a150.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fd4779d80db285921b57ebd8c70000f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9418a0201ca145425b74d42b7ef091a9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdf1457b39c097f386c5c8170c007d94.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8552ad9af3f75f11ec1d2aae32147fc9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da054f3adc86a67719a5dc7e3b2c9198.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fb26d84907c923278ac4626a9d58947.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/048b61a5fb5f420c6d7de88db5bc3aa5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c894b7d6baa55c80c64e74748dad898.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/460317e7c26f95b9b29cfe1a89b796d6.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
【推荐1】如图,在矩形
中,
是边
的中点,连接
交对角线
于点
,若
,
,求
的长.
![](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/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0d5a2cd05e4476fc72271e8fdb59a9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
【推荐2】如图,△ABC中,AB=AC,∠A=36°,BD平分∠ABC.求证:
.
![](https://img.xkw.com/dksih/QBM/2016/4/20/1574195003121664/1574195008684032/STEM/4c190a08714940fd82c01be18f553b47.png)
![](https://img.xkw.com/dksih/QBM/2016/4/20/1574195003121664/1574195008684032/STEM/e025157ed89b4924b84b3edc2804fafd.png)
您最近一年使用:0次