7分之2+(7分之5—5分之2)÷5分之2怎样简算?
人气:156 ℃ 时间:2019-12-17 14:53:28
解答
原式
=2/7+(5/7-2/5)×5/2
=2/7+5/7*5/2-2/5*5/2
=2/7+25/14-1
=4/14+25/14-14/14
=(4+25-14)/14
=15/14
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