4+12(x-y)+9(x-y)^
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4+12(x-y)+9(x-y)^4+12(x-y)+9(x-y)^4+12(x-y)+9(x-y)^4+12(x-y)+9(x-y)^2完全平方公式=[2+3(x-y)]^2=(2+3x-3y)^2
4+12(x-y)+9(x-y)^
4+12(x-y)+9(x-y)^
4+12(x-y)+9(x-y)^
4+12(x-y)+9(x-y)^2完全平方公式
=[2+3(x-y)]^2
=(2+3x-3y)^2
21x-21y+4
=（2+3（x-y））^2
=(3x-3y+2)^2
4+12(x-y)+9(x-y)^
4(x+y)²-12(x+y)(x-y)+9(x-y)²
4(x+y)^2-12(x+y)(x-y)+9(+y)^2因式分解,
已知X.x+y.y-4x+2y+5=0,求4X.X-12X Y+9Y.y的值
9(x-y)-12(y-x)^2
4-12(x-y)+9(x-y)²=?
因式分解：4-12(x-y)+9(x-y)²
因式分解4-12(x-y)+9(x-y)的平方
因式分解4-12(x-y)+9(x-y)²
4-12（x-y）+9(x-y)^2 因式分解
4+9(x-y)²+12(x-y)
4-12(x-y)+9(x-y)^2因式分解
9(x-y)^2+12(x-y)+4因式分解
9(x-y)^2-12(x-y)+4=快
4-12(x-y)+9(x-y)的平方=
12(x-y)-4-9(y-x)的平方......
4+12(x-y)+9(x-y)^2用因式分解
4（x+y）^2-12(x+y)+9因式分解