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49除以28 简便计算
49除以28
人气:199 ℃ 时间:2020-03-27 18:39:29
解答
49÷28
=(7×7)÷(4×7)
=7÷4
=(8-1)÷4
=8÷4-1÷4
=2-0.25
=1.75
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