1234567×3456789的简便计算方法,浙大提前招题,太坑爹了
来源:学生作业帮助网 编辑:作业帮 时间:2024/11/24 14:30:13
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1234567×3456789的简便计算方法,浙大提前招题,太坑爹了
1234567×3456789的简便计算方法,浙大提前招题,太坑爹了
1234567×3456789的简便计算方法,浙大提前招题,太坑爹了
1234567*3456789=(1234567.9-0.9)*3456789
=1234567.9*3456789-0.9*(123456790-120000000-1)
=12345679*345678.9-12345679*9+108000000+0.9
=12345679*345669.9+0.9+108000000
=12345679*9*(38408-7/30)+0.9+108000000
=111111111*38408-111111111*7/30+0.9+108000000
=111111111*38408-25925925+108000000
=3333333330000+
888888888000+
44444444400+
888888888+
108000000-25925925
=4267663551288-
25925925
=4267637625363
其实我觉得还是笔算比较快.