2\3+(4\7+1\2)*7\25 简算
人气:215 ℃ 时间:2020-02-03 15:45:15
解答
2/3+(4/7+1/2)×7/25
=2/3+(8/14+7/14)×7/25
=2/3+15/14 × 7/25
=2/3+3/10
=20/30+9/30
=29/30
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