+8>2x+1811-3x>2x+18-5x>7x<-7/5题有没有错,应该是最大整数解吧,如果是,x=-2,代入6-ax=46-ax=46-a(-2)=46+2a=42a=-2a=-1
X大于等于-5
①2x+18≥3-3x 5x≥-15 x≥-3②-9y＜16 y＞16/9③1/2x≥21/2 x≥21④-2x＜1 x＞-1/2
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