急需!因式分解(1)a(a+b)-5(a+b);(2)(a+b)-(a+b)²;(3)x(x-y)+y(y-x)+x-y;(4)已知m-n=3,mn=-1,求m²n-mn²的值;(5)2x²(y+3)-4x(y+3),其中x=2,y=-10;(6)2007³-2×2007²-2005/2007³+2007²-20
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![急需!因式分解(1)a(a+b)-5(a+b);(2)(a+b)-(a+b)²;(3)x(x-y)+y(y-x)+x-y;(4)已知m-n=3,mn=-1,求m²n-mn²的值;(5)2x²(y+3)-4x(y+3),其中x=2,y=-10;(6)2007³-2×2007²-2005/2007³+2007²-20](/uploads/image/z/1348770-66-0.jpg?t=%E6%80%A5%E9%9C%80%21%E5%9B%A0%E5%BC%8F%E5%88%86%E8%A7%A3%281%29a%28a%2Bb%29-5%28a%2Bb%29%EF%BC%9B%282%29%28a%2Bb%29-%28a%2Bb%29%26%23178%3B%EF%BC%9B%EF%BC%883%EF%BC%89x%28x-y%29%2By%28y-x%29%2Bx-y%EF%BC%9B%EF%BC%884%EF%BC%89%E5%B7%B2%E7%9F%A5m-n%3D3%2Cmn%3D-1%2C%E6%B1%82m%26%23178%3Bn-mn%26%23178%3B%E7%9A%84%E5%80%BC%EF%BC%9B%EF%BC%885%EF%BC%892x%26%23178%3B%28y%2B3%29-4x%28y%2B3%29%2C%E5%85%B6%E4%B8%ADx%3D2%2Cy%3D-10%EF%BC%9B%EF%BC%886%EF%BC%892007%26%23179%3B-2%C3%972007%26%23178%3B-2005%2F2007%26%23179%3B%2B2007%26%23178%3B-20)
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