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(69分之1+71分之2)*23+71分之25 用简便方法做
人气:223 ℃ 时间:2020-02-29 15:07:12
解答
(69分之1+71分之2)*23+71分之25
=1/69*23+2/71*23+25/71
=1/3+46/71+25/71
=1/3+1
=4/3
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