(2011湖南衡阳,20,6分)解不等式组,并把解集在数轴上表示出来

(2011湖南衡阳,20,6分)解不等式组,并把解集在数轴上表示出来.

 

 

答案

【解】 由①得≤3,由②得,不等式组的解集为.解集在数轴上表示为

 

解析:略

 

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