根据杨辉三角的规律,得:(a+b)^2=a^2+2ab+b^2;(a+b)^3=a^3+3a^2b+3ab^2+b^3;(a+b)^4=a^4+4a^3b+6a^2b^2+4ab^3+b^4; (a+b)^5= (a+b)^6=
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![根据杨辉三角的规律,得:(a+b)^2=a^2+2ab+b^2;(a+b)^3=a^3+3a^2b+3ab^2+b^3;(a+b)^4=a^4+4a^3b+6a^2b^2+4ab^3+b^4; (a+b)^5= (a+b)^6=](/uploads/image/z/761578-34-8.jpg?t=%E6%A0%B9%E6%8D%AE%E6%9D%A8%E8%BE%89%E4%B8%89%E8%A7%92%E7%9A%84%E8%A7%84%E5%BE%8B%2C%E5%BE%97%EF%BC%9A%28a%2Bb%29%5E2%3Da%5E2%2B2ab%2Bb%5E2%EF%BC%9B%28a%2Bb%29%5E3%3Da%5E3%2B3a%5E2b%2B3ab%5E2%2Bb%5E3%EF%BC%9B%28a%2Bb%29%5E4%3Da%5E4%2B4a%5E3b%2B6a%5E2b%5E2%2B4ab%5E3%2Bb%5E4%EF%BC%9B++%28a%2Bb%29%5E5%3D++++++++++++++++++++++++++++++++++++++++++++++++++%28a%2Bb%29%5E6%3D)
根据杨辉三角的规律,得:(a+b)^2=a^2+2ab+b^2;(a+b)^3=a^3+3a^2b+3ab^2+b^3;(a+b)^4=a^4+4a^3b+6a^2b^2+4ab^3+b^4; (a+b)^5= (a+b)^6=
根据杨辉三角的规律,得:
(a+b)^2=a^2+2ab+b^2;(a+b)^3=a^3+3a^2b+3ab^2+b^3;(a+b)^4=a^4+4a^3b+6a^2b^2+4ab^3+b^4;
(a+b)^5=
(a+b)^6=
根据杨辉三角的规律,得:(a+b)^2=a^2+2ab+b^2;(a+b)^3=a^3+3a^2b+3ab^2+b^3;(a+b)^4=a^4+4a^3b+6a^2b^2+4ab^3+b^4; (a+b)^5= (a+b)^6=
(a+b)^5=a^5+5a^4b+10a^3b^2+10a^2b^3+5ab^4+b^5
(a+b)^6=a^6+6a^5b+15a^4b^2+20a^3b^3+15a^2b^4+6ab^5+b^6
用杨辉三角解(也可以用二项式定理)他们的系数是 (A+B)^0 1
(A+B)^1 1 1
(A+B)^2 1 2 1
(A+B)^3 1 3 3 1
(A+B)^4 1 4 6 4 1
(A+B)^5 ...
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用杨辉三角解(也可以用二项式定理)他们的系数是 (A+B)^0 1
(A+B)^1 1 1
(A+B)^2 1 2 1
(A+B)^3 1 3 3 1
(A+B)^4 1 4 6 4 1
(A+B)^5 1 5 10 10 5 1
(A+B)^6 1 6 15 20 15 6 1
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