原式=X/0.2-3X/0.4=1.7
2X-3X=0.68
X=-0.68
X*0.2 6 (x*0.2 6-2)=2/3X怎么解
X*0.2 6 (x*0.2 6-2)=2/3X怎么解
数学人气：210 ℃时间：2020-04-12 13:33:18
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