计算(x-2y+3)平方-(x-2y+3)(x-2y-3)

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

计算(x-2y+3)平方-(x-2y+3)(x-2y-3)
(x-2y+3)平方-(x-2y+3)(x-2y-3)
=(x-2y+3)(x-2y+3-x+2y+3)
=6(x-2y+3)
=6x-12y+18

(x-2y+3)^2-(x-2y+3)(x-2y-3)=(x-2y+3)(x-2y+3-x+2y+3)=6(x-2y+3)=6x-12y+18

x-2y+3)平方-(x-2y+3)(x-2y-3)
=(x-2y)^2+6(x-2y)+9-(x-2y)^2-9
=6x-12y