(0.2x+0.2x+120)*2+100=x
0.8x+240+100=x
x-0.8x=340
0.2x=340
x=1700
(0.2x+0.2x+120)*2+100=x 怎么解
(0.2x+0.2x+120)*2+100=x 怎么解
数学人气:813 ℃时间:2020-02-02 19:48:54
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