x2+2xy-8y2+2x+8y因式分解
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x2+2xy-8y2+2x+8y因式分解x2+2xy-8y2+2x+8y因式分解x2+2xy-8y2+2x+8y因式分解x^2+2xy-8y^2+2x+8y=(x+4y)(x-2y)+2(x+4y)=
x2+2xy-8y2+2x+8y因式分解
x2+2xy-8y2+2x+8y因式分解
x2+2xy-8y2+2x+8y因式分解
x^2+2xy-8y^2+2x+8y
=(x+4y)(x-2y)+2(x+4y)
=(x+4y)(x-2y+2)
x2+2xy-8y2+2x+8y=(x-2y)(x+4y)+2(x+4y)=(x+4y)(x-2y+2)
x²+2xy-8y²+2x+8y= x²+2xy+y²-9y²+8y=(x+y)²-y(9y-8)
第一步：原式=x2+2xy+y2-9y2+8y+14/9+2x-14/9
第二步：=（x+y)2-(3y+4/3)2+2x
就分解到这一步了
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