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(x-30)/(180-x+30)=2/3怎样解?
人气:209 ℃ 时间:2020-05-07 09:05:59
解答
(x-30) / (180-x+30)=2/3 可转换为
(x-30) * 3 = (180-x+30) * 2
3x - 90 = 360 - 2x + 60
5x = 510
x = 102
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