(a+b)^5等于啥子?

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(a+b)^5等于啥子?
(a+b)^5等于啥子?

(a+b)^5等于啥子?
(a+b)^5=(a+b)^2 * (a+b) ^3 =(a^2+2ab+b^2)(a^3+b^3+3a^2b+3ab^2)=a^5+5a^4b+10a^3b^2+10a^2b^3+5ab^4+b^5

a^5+5a^4b+10a^3b^2+10a^2b^3+5ab^4+b^5

a^5+5a^4b+10a^3b^2+10a^2b^3+5ab^4+b^5
杨辉定理: 1
1 1
1 2 1
...

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a^5+5a^4b+10a^3b^2+10a^2b^3+5ab^4+b^5
杨辉定理: 1
1 1
1 2 1
1 3 3 1
1 4 6 4 1
1 5 10 10 5 1
以此类推

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