( )·(-2xy)=4x²y-6xy²
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()·(-2xy)=4x²y-6xy²()·(-2xy)=4x²y-6xy²()·(-2xy)=4x²y-6xy²-2x+3y因为(4x
( )·(-2xy)=4x²y-6xy²
( )·(-2xy)=4x²y-6xy²
( )·(-2xy)=4x²y-6xy²
-2x+3y
因为(4x²y-6xy²)/(-2xy)=-2x+3y
﹙ ﹚=﹙4x²y-6xy²﹚÷﹙﹣2xy﹚
=﹣2x+3y.
(3y-2x )·(-2xy)=4x²y-6xy²