(2X-3Y+4)(-2X-3Y-4)化简
10个回答
(2X-3Y+4)(-2X-3Y-4)
= -[(2X+4)-3Y][(2X+4)+3Y]
= -[(2X+4)^2-(3Y)^2]
=9Y^2-4(X+2)^2
=9Y^2-4X^2-16X-16
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