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22.5/x=31.5/12+x的解题步骤
人气:178 ℃ 时间:2020-06-26 17:57:51
解答
22.5/x=31.5/(12+x)
31.5x=22.5(12+x)
31.5x=270+22.5x
31.5x-22.5x=270
9x=270
x=270÷9
x=30
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