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x-30%x=4分之3
人气:226 ℃ 时间:2020-03-29 02:37:50
解答
30% =0.3
所以原式就是
x-0.3x = 3/4
=>
0.7 x = 3/4
=>
x = 0.75/0.7 = 75/70=15/14
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