若p:ABS,q:(B)(A),则p是q的什么条件?

p:ABS,q:(*B*A),则pq的什么条件?

答案

思路分析:

与集合有关的问题可用韦恩图分析说明.

解:

利用集合的图示法,由图知ABS*B*A),(*B*AABS.

pq的充分条件,也是必要条件.

温馨提示

本题采用的是从条件直接推结论的方法,其中突出了数形结合的思想方法(图示法).

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