如图1,E为矩形ABCD边AD上一点,点P从点B沿折线BE﹣ED﹣DC运动到点C时停止,点Q从点B沿BC运动到点C时停止,它们运动的速度都是1cm/s.若点P,Q同时开始运动,设运动时间为t(s),△BPQ的面积为y(cm2).已知y与t的函数关系图象如图2,有下列四个结论:①AE=6cm;②sin∠EBC=
;③当0<t≤10时,y=
t2; ④当t=12s时,△PBQ是等腰三角形.其中正确结论的序号是_______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7294f5ae2a24ff42e84cd9773b2a7287.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d33adb74906403b0b00fcbd9fa691d8b.png)
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2016·山西大同·一模 查看更多[2]
更新时间:2019-01-30 18:14:09
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【推荐1】抛物线y=2x2-4x+3绕坐标原点旋转180º所得的抛物线的解析式是___________ .
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【推荐2】如图,把一块等腰直角三角板△ABC,∠C=90°,BC=5,AC=5.现将△ABC沿CB方向平移到△A′B′C′的位置,若平移距离为x(0≤x≤5),△ABC与△A′B′C′的重叠部分的面积y,则y=__________ (用含x的代数式表示y).
![](https://img.xkw.com/dksih/QBM/2016/3/8/1573981657309184/1573981663715328/STEM/266a63f8ba374392a512c43e1e8c4985.png?resizew=130)
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【推荐1】如图,已知
为四边形
的外接圆,
为圆心,若
,
,则
的半径长为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
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【推荐2】小明用一块含有
角(
)的直角三角尺测量校园内某棵树的高度,示意图如图所示.若小明的眼睛与地面之间的垂直高度
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.(结果精确到
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)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6755c22391da52774be5606fb0a919ef.png)
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