大伙帮个忙啊! 分解因式! 1. x²-y²+x+y 2. x²-2xy+y²-a² 3.大伙帮个忙啊! 分解因式! 1. x²-y²+x+y 2. x²-2xy+y²-a² 3. 9m²-n²+3m-n 4. x^4-4x²-4xy-y² 快呀!
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大伙帮个忙啊! 分解因式! 1. x²-y²+x+y 2. x²-2xy+y²-a² 3.大伙帮个忙啊! 分解因式! 1. x²-y²+x+y 2. x²-2xy+y²-a² 3. 9m²-n²+3m-n 4. x^4-4x²-4xy-y² 快呀!
大伙帮个忙啊! 分解因式! 1. x²-y²+x+y 2. x²-2xy+y²-a² 3.
大伙帮个忙啊! 分解因式! 1. x²-y²+x+y 2. x²-2xy+y²-a² 3. 9m²-n²+3m-n 4. x^4-4x²-4xy-y² 快呀!
大伙帮个忙啊! 分解因式! 1. x²-y²+x+y 2. x²-2xy+y²-a² 3.大伙帮个忙啊! 分解因式! 1. x²-y²+x+y 2. x²-2xy+y²-a² 3. 9m²-n²+3m-n 4. x^4-4x²-4xy-y² 快呀!
1.(x+y)(x-y-1)
2.(x-y-a)(x-y+a)
x²-y²+x+y =(x+y)(x-y)+(x+y) =(x+y)(x-y+1) 2. x²-2xy+y²-a² =(x-y)²-a²=(x-y+a)(x-y-a) 3. 9m...
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x²-y²+x+y =(x+y)(x-y)+(x+y) =(x+y)(x-y+1) 2. x²-2xy+y²-a² =(x-y)²-a²=(x-y+a)(x-y-a) 3. 9m²-n²+3m-n =(3m+n)(3m-n)+(3m-n)=(3m-n)(3m+n+1) 4. x^4-4x²-4xy-y² =(x^4-y²)-(4x²+4xy) =(x²+y²)(x²-y²)-4x(x+y) =(x²+y²)(x-y)(x+y)-4x(x+y) =(x+y)【(x²+y²)(x-y)-4x】 完毕!
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