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数学
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(200-125)×18,99×99+199用简便方法算
人气:130 ℃ 时间:2019-10-25 02:35:34
解答
(200-125)×18
=75×(20-2)
=1500-150
=1350
99×99+199
=99×99+99+100
=99×(99+1)+100
=100×(99+1)
=10000
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