4+12(x-y)+9(x-y)^2分解因式的thanks..

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4+12(x-y)+9(x-y)^2分解因式的thanks..4+12(x-y)+9(x-y)^2分解因式的thanks..4+12(x-y)+9(x-y)^2分解因式的thanks..4+12(x-

4+12(x-y)+9(x-y)^2分解因式的thanks..
4+12(x-y)+9(x-y)^2
分解因式的
thanks..

4+12(x-y)+9(x-y)^2分解因式的thanks..
4+12(x-y)+9(x-y)^2
=2^2+2*2*[3(x-y)]+[3(x-y)]^2
=[2+3(x-y)]^2
=(3x-3y+2)^2

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

=[3(x-y)+2]^2 =(3x-3y+2)^2

=[3(x-y)+2]^2 =(3x-3y+2)^2