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数学
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(2/21+1/25)×21×25简算
人气:144 ℃ 时间:2020-01-27 08:49:07
解答
答:
(2/21+1/25)×21×25
=21×25×(2/21)+21×25×(1/25)
=25×2+21×1
=50+21
=71
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