问题
选择题
若全集U=R，集合M={x|x2＞4}，N={x|
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答案
∵全集U=R，M={x|x＞2，或 x＜-2 }，N={x|-1＜x＜3}，
∴CUN={x|x≤-1，或 x≥3}，M∩（CUN）={x|x＜-2，或 x≥3}，
故选 B．
搜题请搜索小程序“爱下问搜题”
若全集U=R，集合M={x|x2＞4}，N={x|
|
∵全集U=R，M={x|x＞2，或 x＜-2 }，N={x|-1＜x＜3}，
∴CUN={x|x≤-1，或 x≥3}，M∩（CUN）={x|x＜-2，或 x≥3}，
故选 B．
| 阅读理解。 | |||
| My name is Strong. I am ten years old. I am from Africa(非洲). I have a long nose. I can play games with my nose. I think I am clever and friendly. Hi! I am Fule. I come from China. I am five years old. I am black and white. I l | |||
| Strong | Fule | Peter | |
| C | Elephant(大象) | panda | tiger |
| B | tiger | elephant | panda |
| C | elephant | tiger | panda |
| D | tiger | panda | elephant |