(a+b)^n=Cn0(a^n)(b^0)+Cn1(a^n-1)(b^1)+Cn2(a^n-2)(b^2)+……Cn(n-1(a^1)(b^n-1)+Cnn(a^0)(b^n)
注，Cnk为n!/k!(n-k)!
匿名回答于2024-06-03 16:57:24
