(x-2)*60/x 怎么变成60-120/X
人气:112 ℃ 时间:2020-02-06 05:02:18
解答
[(x-2)*60]/x
=(60x-120)/x
=(60x)/x-120/x
=60-120/x看不懂啊啊 啊啊= =。~!!!
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