(2a+3b)(-2a-3b)
=-4a^2-12ab-9b^2
;(1/2x+1/3y^2)(-1/2x-1/3y^2)
=-1/4x^2-1/3xy^2-1/9y^4
:(x^2-2y^2)^2-(x^2-2y^2)^2这个题目看看,可能有问题
=0
(2a+3b)(-2a-3b);(1/2x+1/3y^2)(-1/2x-1/3y^2):(x^2-2y^2)^2-(x^
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