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通分 最小公倍数为0.15 ,通分得: 0.5(x-1)-0.3(x+2)=0.18, 0.2x-1.1=0.18 ,0.2x=0.18+1.1 ,0.2x=1.28 ,x=6.4 够仔细了吧 楼主加分啊 [