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(10^9 + 10^8 + ... +10^0) (10^9 + 10^8 + ... +10^0), 1 way to get 10^18, 2 ways to get 10^17, ....

hhyang (拍砖客)
(#11432184@0)
2018-3-20 -05:00
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Back To Topic: 一道奥数题,数学好的同学能不能来解释一下,为什么111111111 x 111111111 = 12345678987654321?这里存在一个什么样的逻辑思路?

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