0.25*(x-10)=-30*2-10
人气:429 ℃ 时间:2020-03-27 13:55:52
解答
0.25*(x-10)=-30*2-10
0.25*x-0.25*10=60-10
0.25*x-2.5=50
0.25x=50+2.5
0.25x=52.5
x=52.5/0.25
x=210
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