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数学
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5*(1200-x)-4x=1680 怎样算
人气:178 ℃ 时间:2020-05-19 09:14:25
解答
5*(1200-x)-4x=1680
6000-5x-4x=1680
5x+4x=6000-1680
9x=4320
x=4320÷9
x=480
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