40.3乘123.123123-0.123乘40340.3403乘就是算式中的叉

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40.3乘123.123123-0.123乘40340.3403乘就是算式中的叉40.3乘123.123123-0.123乘40340.3403乘就是算式中的叉40.3乘123.123123-0.12

40.3乘123.123123-0.123乘40340.3403乘就是算式中的叉
40.3乘123.123123-0.123乘40340.3403
乘就是算式中的叉

40.3乘123.123123-0.123乘40340.3403乘就是算式中的叉
答案是0,不断地变换小数点位置就可以了.
40.3×123.123123-0.123×40340.3403
=40.3×123.123123-123×40.3403403
=40.3×(123+0.123123)-123×(40.3+0.0403403)
消掉40.3×123后重复类似操作

40.3×123.123123-0.123×40340.3403
=(403×1001001×123-123×403×1001001)/10000000
=0