若a+b=-3 ab=2,则若a^2b^2__________ (a-b)^2______

问题描述:

若a+b=-3 ab=2,则若a^2b^2__________ (a-b)^2______

a^2b^2
=(ab)^2
=2^2
=4
(a-b)^2
=(a+b)^2-4ab
=(-3)^2-4*2
=9-8
=1