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+y2.x²-2xy+y²-a²3.大伙帮个忙啊!分解因式!1.x²-y²+x+y2.x

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)

  1.  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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    1.  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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