1.已知x+y= -4,xy= -12,则y+1/x+1 + x+1/y+1 等于?2.若 1/a + 1/b = 1/a-b,则b/a - a/b 等于?3.若x / y+z = a,y / x+z = b ,z / x+y =c,且x+y+z ≠ 0,则 a/1+a + b/1+b + c/1+C等于?..
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![1.已知x+y= -4,xy= -12,则y+1/x+1 + x+1/y+1 等于?2.若 1/a + 1/b = 1/a-b,则b/a - a/b 等于?3.若x / y+z = a,y / x+z = b ,z / x+y =c,且x+y+z ≠ 0,则 a/1+a + b/1+b + c/1+C等于?..](/uploads/image/z/386622-54-2.jpg?t=1.%E5%B7%B2%E7%9F%A5x%2By%3D+-4%2Cxy%3D+-12%2C%E5%88%99y%2B1%2Fx%2B1+%2B+x%2B1%2Fy%2B1+%E7%AD%89%E4%BA%8E%3F2.%E8%8B%A5+1%2Fa+%2B+1%2Fb+%3D+1%2Fa-b%2C%E5%88%99b%2Fa+-+a%2Fb+%E7%AD%89%E4%BA%8E%3F3.%E8%8B%A5x+%2F+y%2Bz+%3D+a%2Cy+%2F+x%2Bz+%3D+b+%2Cz+%2F+x%2By+%3Dc%2C%E4%B8%94x%2By%2Bz+%E2%89%A0+0%2C%E5%88%99+a%2F1%2Ba+%2B+b%2F1%2Bb+%2B+c%2F1%2BC%E7%AD%89%E4%BA%8E%3F..)
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1.已知x+y= -4,xy= -12,则y+1/x+1 + x+1/y+1 等于?2.若 1/a + 1/b = 1/a-b,则b/a - a/b 等于?3.若x / y+z = a,y / x+z = b ,z / x+y =c,且x+y+z ≠ 0,则 a/1+a + b/1+b + c/1+C等于?..
1.已知x+y= -4,xy= -12,则y+1/x+1 + x+1/y+1 等于?
2.若 1/a + 1/b = 1/a-b,则b/a - a/b 等于?
3.若x / y+z = a,y / x+z = b ,z / x+y =c,且x+y+z ≠ 0,则 a/1+a + b/1+b + c/1+C等于?
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1.已知x+y= -4,xy= -12,则y+1/x+1 + x+1/y+1 等于?2.若 1/a + 1/b = 1/a-b,则b/a - a/b 等于?3.若x / y+z = a,y / x+z = b ,z / x+y =c,且x+y+z ≠ 0,则 a/1+a + b/1+b + c/1+C等于?..
负15分之34
负1