Question

若a-b=0则a^2*b^2分之a^4+3a^3b-2a^2b^2-4ab^3+b^4

Answer 1

规范的是a=b≠0

a^2*b^2分之a^4+3a^3b-2a^2b^2-4ab^3+b^4

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

=a^4+3a^4-2a^4-4a^4+a^4

=-a^4