13-14高二上·黑龙江双鸭山·期末
1 . 如图,用与底面成
角的平面截圆柱得一椭圆截线,则该椭圆的离心率为
![](https://img.xkw.com/dksih/QBM/2013/3/27/1571163345985536/1571163351212032/STEM/b4a704e56f5b4b2ba073a7bbea01d0a3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d6d0da8d77360826b3c500dcf812dc34.png)
![](https://img.xkw.com/dksih/QBM/2013/3/27/1571163345985536/1571163351212032/STEM/b4a704e56f5b4b2ba073a7bbea01d0a3.png)
A.![]() | B.![]() | C.![]() | D.非上述结论 |
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9-10高二下·河南焦作·期末
2 . 已知,如图,在梯形ABCD中,AD∥BC,AD=3,BC=7,点M,N分别是对角线BD,AC的中点,则MN=
![](https://img.xkw.com/dksih/QBM/2014/11/10/1571892604821504/1571892610424832/STEM/efd44bfec3544256b3ebb2de320a755f.png)
![](https://img.xkw.com/dksih/QBM/2014/11/10/1571892604821504/1571892610424832/STEM/efd44bfec3544256b3ebb2de320a755f.png)
A.2 | B.5 | C.![]() | D.![]() |
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10-11高二下·黑龙江牡丹江·期末
3 . 在
中,
是斜边上的高线,
则
为.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f8f88798ec42a58dccd212586382b23.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b28ef176d78867a81ac621c62e341b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91acc65064f9b4ce4520cac292a84a11.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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