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数学
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0.3*(x-0.7x)=3.6解方程
人气：389 ℃ 时间：2020-06-03 01:54:41
解答
0.3*(x-0.7x)=3.6
0.3x=3.6/0.3=12
x=12/0.3=40
x=40
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