已知1/x-1/y=2,求分式-x-xy+y/3x+xy-3y的值已知x^2/x^2-2=1/1-a,求(1/1-x - 1/1+x)除以(x/x^2-1 +x)的值(用a表示)
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![已知1/x-1/y=2,求分式-x-xy+y/3x+xy-3y的值已知x^2/x^2-2=1/1-a,求(1/1-x - 1/1+x)除以(x/x^2-1 +x)的值(用a表示)](/uploads/image/z/2524295-47-5.jpg?t=%E5%B7%B2%E7%9F%A51%2Fx-1%2Fy%3D2%2C%E6%B1%82%E5%88%86%E5%BC%8F-x-xy%2By%2F3x%2Bxy-3y%E7%9A%84%E5%80%BC%E5%B7%B2%E7%9F%A5x%5E2%2Fx%5E2-2%3D1%2F1-a%2C%E6%B1%82%281%2F1-x+-+1%2F1%2Bx%29%E9%99%A4%E4%BB%A5%28x%2Fx%5E2-1+%2Bx%29%E7%9A%84%E5%80%BC%28%E7%94%A8a%E8%A1%A8%E7%A4%BA%29)
已知1/x-1/y=2,求分式-x-xy+y/3x+xy-3y的值已知x^2/x^2-2=1/1-a,求(1/1-x - 1/1+x)除以(x/x^2-1 +x)的值(用a表示)
已知1/x-1/y=2,求分式-x-xy+y/3x+xy-3y的值
已知x^2/x^2-2=1/1-a,求(1/1-x - 1/1+x)除以(x/x^2-1 +x)的值(用a表示)
已知1/x-1/y=2,求分式-x-xy+y/3x+xy-3y的值已知x^2/x^2-2=1/1-a,求(1/1-x - 1/1+x)除以(x/x^2-1 +x)的值(用a表示)
已知1/x-1/y=2,求分式-x-xy+y/3x+xy-3y的值
=(-1/y-1+1/x)/(3/y+1-3/x)
=(2-1)/(3×(-2)+1)
=1/(-5)
=-1/5;
已知x^2/x^2-2=1/1-a,
1/(1-2/x²)=1/(1-a);
1-2/x²=1-a;
2/x²=a;
求(1/1-x - 1/1+x)除以(x/x^2-1 +x)的值(用a表示)
=(1+x-1+x)/(1-x²)×(x²-1)/x³
=-2/x²
=-a;
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