如图①,在△ABC中,∠C=90°,∠A=30°,点D是AB边的中点,点P从点A出发,沿着AC﹣CB运动,到达点B停止.设点P的运动路径长为x,连DP,记△APD的面积为y,若表示y与x有函数关系的图象如图②所示,则△ABC的周长为( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/10/c880a9a1-02da-49e8-9c11-31d88ed13b5f.png?resizew=350)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/10/c880a9a1-02da-49e8-9c11-31d88ed13b5f.png?resizew=350)
A.6+2![]() | B.4+2![]() | C.12+4![]() | D.6+4![]() |
21-22八年级上·浙江金华·期末 查看更多[4]
浙江省金华市东阳市2021-2022学年八年级上学期期末数学试题(已下线)第11讲 一次函数的图像与性质(19大考点)-2022-2023学年八年级数学上学期考试满分全攻略(浙教版)(已下线)第5章一次函数(基础、典型、易错、压轴)分类专项训练-2022-2023学年八年级数学上学期考试满分全攻略(浙教版)(已下线)浙江八年级上学期期末【易错60题考点专练】-2022-2023学年八年级数学上学期考试满分全攻略(浙教版)
更新时间:2022-09-09 10:32:50
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【推荐1】如图1,在等腰梯形ABCD中,∠B=60°,P、Q同时从B出发,以每秒1单位长度分别沿B-A-D-C和B-C-D方向运动至相遇时停止,设运动时间为t(秒),△BPQ的面积为S(平方单位),S与t的函数图象如图2所示,则下列结论错误的是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/30/91cea25e-1149-45ee-95ab-b760aa0f5153.png?resizew=378)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/30/91cea25e-1149-45ee-95ab-b760aa0f5153.png?resizew=378)
A.当t=4秒时,S=4![]() |
B.AD=4 |
C.当4≤t≤8时,S=2![]() |
D.当t=9秒时,BP平分梯形ABCD的面积 |
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【推荐2】如图①,在矩形
中,动点
从点
出发,沿
的路线运动,当点
到达点
时停止运动.若
,交
于点
,设点
运动的路程为
,
,已知
关于
的函数图象如图②所示,当
时,
的值为( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/22/59aee9ee-5607-4656-9098-3b5f0f84dde4.png?resizew=318)
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A.![]() | B.![]() | C.![]() | D.![]() |
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【推荐1】如图,等腰直角三角形△OAB的边OA和矩形OCDE的边OC在x轴上,OA=4,OC=1,OE=2.将矩形OCDE沿x轴正方向平移t(t>0)个单位,所得矩形与△OAB公共部分的面积记为S(t).将S(t)看作t的函数,当自变量t在下列哪个范围取值时,S(t)是t的一次函数( )
A.1<t<2 | B.2<t<3 |
C.3<t<4 | D.1<t<2或4<t<5 |
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【推荐2】在平面直角坐标系中,正方形ABCD的位置如图所示,点A的坐标为(1,0),点D的坐标为(0,2).延长CB交x轴于点A1,作正方形A1B1C1C;延长C1B1交x轴于点A2,作正方形A2B2C2C1…按这样的规律进行下去,第2012个正方形的面积为( )
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/6/3955c271-6bf4-48b5-bae0-64ac2b1143bb.png?resizew=193)
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A.![]() | B.![]() | C.![]() | D.![]() |
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【推荐1】如图,△ABC中,∠A=60°,BM⊥AC于点M,CN⊥AB于点N,BM,CN交于点O,连接MN.下列结论:①∠AMN=∠ABC;②图中共有8对相似三角形;③BC=2MN.其中正确的个数是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/11/b079dcab-3ffc-4604-a9f2-385d5a410874.png?resizew=146)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/11/b079dcab-3ffc-4604-a9f2-385d5a410874.png?resizew=146)
A.1个 | B.2个 | C.3个 | D.0个 |
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【推荐2】如图,
,
,
在正方形
的边上,
,
垂直平分
交
于
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的值为( )
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中,
为
上一点,连接
与
交于点
,点
在
上,点
在
上,连接
交
于点
,且
,垂足为
,若
为
的中点,则下列结论:①
;②
;③
;④
.其中结论正确的个数有( )
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【推荐2】如图,已知在等腰Rt△ABC中,∠ACB=90°,AD为BC边的中线,过点C作CE⊥AD于点E,交AB于点F.若AC=2,则线段EF的长为( )
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