简便计算 2/17÷5+1/5×15/17
人气：308 ℃ 时间：2020-04-25 03:49:03
解答
2/17÷5+1/5×15/17
=2/17×1/5+1/5×15/17
=(2/17+15/17)×1/5
=1/5
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