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125乘以23和102乘以23各用简便方法怎么算
人气:497 ℃ 时间:2020-01-27 23:10:09
解答
125×23
=125×(24-1)
=125×8×3-125
=3000-125
=2875
102×23
=(100+2)×23
=100×23+2×23
=2300+46
=2346
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