作业帮计算:(x+2y-3)(x-2y+3)
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计算:(x+2y-3)(x-2y+3)
计算:(x+2y-3)(x-2y+3)
计算:(x+2y-3)(x-2y+3)
(x+2y-3)(x-2y+3)
=[x+(2y-3)][x-(2y-3)]
=x²-(2y-3)²
=x²-(4y²-12y+9)
=x²-4y²+12y-9
=x^2-(2y-3)^2
=x^2-4y^2+12y-9
(x+2y-3)(x-2y+3)=[x+(2y-3)][x-(2y-3)]=x^2-(2y-3)^2
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