666···6*999···9(2001个6 2001个9)简便算法

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666···6*999···9(2001个6 2001个9)简便算法
666···6*999···9(2001个6 2001个9)简便算法

666···6*999···9(2001个6 2001个9)简便算法
6*9=54
66*99=6534
666*999=665334
6666*9999=66653334
66666*99999=6666533334
6.6(n个6）*9...9（n个9）=6...6((n-1)个6）53...3((n-1)个3）4
所以
666···6*999···9(2001个6 2001个9)=666···6(2000个6）5 333...3(2000个3）4
这种都是可以使找规律的,一般重叠的数一般都是可以寻找规律的,当然了你也可以通过计算
就像刚才一楼那种的计算,也是很好的

666……×999……
=666……×(1000……－1）
=666……(2001个6)000……(2001个0)－666……(2001个6）
=666……(2000个6)5333……(2000个3)4

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