名校
解题方法
1 . 设
是两个非空集合,定义集合间的一种运算“
”:
且
.如果
,
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c74a907dda6bb7d9d56d009d9df253.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/091e86ca89e484b331fd90125a5e5af3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf448e6b19b11bb309e4b8f2e4e79cd6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dfcc4b0bd01c717cac051a0e626a6171.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac3e839f6d6cdfb99187f3b871519e5a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a84fd2a24aaf702c8303274ebeb5fcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8fa11710cf9bba31c3f7f51ee2e9711.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
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解题方法
2 . 正方体的棱长为2,则该正方体的体积与其内切球表面积的比为______ .
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解题方法
3 . 若两直线
与
平行,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6c57bbef89a37f1a3808c0ceeac0c22.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08b8c8f407eaca4debe67d12691354b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c13804c54d03efbe035b9ce9e964d85.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6c57bbef89a37f1a3808c0ceeac0c22.png)
您最近一年使用:0次