(80-x)2/7=40-x
人气:136 ℃ 时间:2020-04-14 11:46:25
解答
(80-x)2/7=40-x
160/7-2x/7=40-x
x-2x/7=40-160/7
5x/7=120/7
x=120/7*7/5
x=24
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