(7x-650):(5x+650)=3:4一部一部的解出来!
人气：105 ℃ 时间：2020-05-02 08:13:08
解答
(7x-650):(5x+650)=3:4
4(7x-650)=3(5x+650)
28x-2600=15x+1950
28x-15x=2600+1950
13x=1550
x=350
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