分姐因式 4+12(x-y)+9(x-y)* *为二次方

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分姐因式4+12(x-y)+9(x-y)**为二次方分姐因式4+12(x-y)+9(x-y)**为二次方分姐因式4+12(x-y)+9(x-y)**为二次方(3(x-y))^2+2*(3(x-y))*

分姐因式 4+12(x-y)+9(x-y)* *为二次方
分姐因式 4+12(x-y)+9(x-y)* *为二次方

分姐因式 4+12(x-y)+9(x-y)* *为二次方
(3(x-y))^2+2*(3(x-y))*2+2^2 (完全平方式)
=(3(x-y)+2)^2

[3(x-y)+2]²

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