Question

(a-b)⁴是多少

Answer 1

可以当成 [(a-b)^2]*[(a-b)^2] 这样比较简单
最后结论应该是a^4-4a^3b+6a^2b^2-4ab^3+b^4

Answer 2

(a-b）⁴=a^4+b^4-4a^3b-4ab^3+6a^2b^2

Answer 3

a^3-4a^3b+6a^2b^2-4ab^3+b^4

Answer 4

=[(a+b)²]² =[a²+2ab+b²]² =a⁴ +4a²b²+b⁴ +4a³b+2a²b²+4ab³