(x-2y+3)(x+2y-3) 计算,

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(x-2y+3)(x+2y-3)计算,(x-2y+3)(x+2y-3)计算,(x-2y+3)(x+2y-3)计算,原式=[x-(2y-3)][x+(2y-3)]=x²-(2y-3)²

(x-2y+3)(x+2y-3) 计算,
(x-2y+3)(x+2y-3) 计算,

(x-2y+3)(x+2y-3) 计算,
原式=[x-(2y-3)][x+(2y-3)]
=x²-(2y-3)²
=x²-4y²+12y-9