已知AB=2,A-B=4,求(2ab^2+1/(a-b)^2)-(1+2a^2b/(b-a)^2)_数学解答

已知AB=2,A-B=4,求(2ab^2+1/(a-b)^2)-(1+2a^2b/(b-a)^2)

人气：152 ℃　时间：2020-06-10 12:28:01

解答

(2ab^2+1/(a-b)^2)-(1+2a^2b/(b-a)^2)
=(2ab^2+1-1-2a^2b)/(a-b)^2
=2ab(b-a)/(b-a)^2
=2ab/(b-a)
=4/-4
=-1