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8分之5×【(4分之3-2分之1)÷12分之5】要简便
人气:467 ℃ 时间:2020-03-23 10:08:35
解答
5/8×[(3/4-1/2)÷5/12]
=5/8×(3/4-1/2)÷5/12
=5/8×(3/4-1/2)×12/5
=5/8×12/5×(3/4-1/2)
=3/2×(3/4-1/2)
=3/2×1/4
=3/8
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