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(6x+180)/(5x+30)=1.5
人气:398 ℃ 时间:2020-04-16 18:45:01
解答
(6x+180)/(5x+30)=3/2
2(6x+180)=3(5x+30)
12x+360=5x+90
-3x=-270
x=90
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