分解因式(x+y)^2-9x^2

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分解因式(x+y)^2-9x^2分解因式(x+y)^2-9x^2分解因式(x+y)^2-9x^2(x+y)^2-9x^2=(x+y)^2-(3x)^2=(x+y+3x)(x+y-3x)=(4x+y)(

分解因式(x+y)^2-9x^2
分解因式(x+y)^2-9x^2

分解因式(x+y)^2-9x^2
(x+y)^2-9x^2
=(x+y)^2-(3x)^2
=(x+y+3x)(x+y-3x)
=(4x+y)(y-2x)

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

(x+y)²-9x²
=(x+y+3x)(x+y-3x)
=(4x+y)(y-2x)

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