3-2分之3*21分之10-7分之2怎样简便
人气:202 ℃ 时间:2019-11-15 07:11:16
解答
3-2分之3*21分之10-7分之2
=3-7分之5-7分之2
=3-(7分之5+7分之2)
=3-1
=2
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