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刚刚那道题:9X-3(12-X)=84具体怎么解
人气:180 ℃ 时间:2020-05-20 17:26:45
解答
9x - 3(12 - x) = 84
9x - 36 + 3x = 84
9x + 3x = 84 + 36
12x = 120
x = 120 ÷ 12
x = 10
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