16-24(x-y)+9(x-y)^2kuai

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16-24(x-y)+9(x-y)^2kuai16-24(x-y)+9(x-y)^2kuai16-24(x-y)+9(x-y)^2kuai(3(x-y)-4)^2=(3x-3y-4)^2

16-24(x-y)+9(x-y)^2kuai
16-24(x-y)+9(x-y)^2
kuai

16-24(x-y)+9(x-y)^2kuai
(3(x-y)-4)^2
=(3x-3y-4)^2