a加b的和的4次方等于什么?

2025-05-18 04:07:42
推荐回答(1个)
回答1:

(a+b)^4
=[(a+b)^2]^2
=(a^2+2ab+b^2)^2
=a^4+2a^2(2ab+b^2)+(2ab+b^2)^2
=a^4+4a^3b+6a^2b^2+4ab^3+b^4