作业帮又是一道分式:x/(x^2-2xy+y^2)*(x^3-y^3)/(x^3+x^2y+xy^2)+[1/(x-y)]-2已知:x和y是方程x+2y=4和x-y=-5的解
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![又是一道分式:x/(x^2-2xy+y^2)*(x^3-y^3)/(x^3+x^2y+xy^2)+[1/(x-y)]-2已知:x和y是方程x+2y=4和x-y=-5的解](/uploads/image/z/3801127-31-7.jpg?t=%E5%8F%88%E6%98%AF%E4%B8%80%E9%81%93%E5%88%86%E5%BC%8F%3Ax%2F%28x%5E2-2xy%2By%5E2%29%2A%28x%5E3-y%5E3%29%2F%28x%5E3%2Bx%5E2y%2Bxy%5E2%29%2B%5B1%2F%28x-y%29%5D-2%E5%B7%B2%E7%9F%A5%3Ax%E5%92%8Cy%E6%98%AF%E6%96%B9%E7%A8%8Bx%2B2y%3D4%E5%92%8Cx-y%3D-5%E7%9A%84%E8%A7%A3)
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又是一道分式:x/(x^2-2xy+y^2)*(x^3-y^3)/(x^3+x^2y+xy^2)+[1/(x-y)]-2已知:x和y是方程x+2y=4和x-y=-5的解
又是一道分式:x/(x^2-2xy+y^2)*(x^3-y^3)/(x^3+x^2y+xy^2)+[1/(x-y)]-2
已知:x和y是方程x+2y=4和x-y=-5的解
又是一道分式:x/(x^2-2xy+y^2)*(x^3-y^3)/(x^3+x^2y+xy^2)+[1/(x-y)]-2已知:x和y是方程x+2y=4和x-y=-5的解
原式=[x/(x-y)^2]*(x-y)(x^2+xy+y^2)/x(x^2+xy+y^2)+[1/(x-y)]-2
=1/(x-y)+1/(x-y)-2
=2/(x-y)-2
=2/(-5)-2
=-12/5
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又是一道分式:x/(x^2-2xy+y^2)*(x^3-y^3)/(x^3+x^2y+xy^2)+[1/(x-y)]-2已知:x和y是方程x+2y=4和x-y=-5的解
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