因式分解:9(x-y)²-12(x-y)+4=

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因式分解:9(x-y)²-12(x-y)+4=
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因式分解:9(x-y)²-12(x-y)+4=
因式分解:9(x-y)²-12(x-y)+4=

因式分解:9(x-y)²-12(x-y)+4=
9(x-y)^2-12(x-y)+4=[3(x-y)]^2-2*3*2(x-y)+2^2=[3(x-y)-2]^2=(3x-3y-2)^2

[3(x-y)-2]²

9X²-18XY+9Y²+4

原式=(3x-3y+2)^2