急已知三个数x y z满足xy/(x+y)=-2,yz/(y+z)=4/3,zx/(z+x)=-4/3,则xyz/(xy+yz+zx)的值为多少两边除以了2得1/x+1/y+1/z=-1/4后和xyz/(xy+yz+zx)是什么关系 我没看懂 在线等啊!
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![急已知三个数x y z满足xy/(x+y)=-2,yz/(y+z)=4/3,zx/(z+x)=-4/3,则xyz/(xy+yz+zx)的值为多少两边除以了2得1/x+1/y+1/z=-1/4后和xyz/(xy+yz+zx)是什么关系 我没看懂 在线等啊!](/uploads/image/z/1626231-39-1.jpg?t=%E6%80%A5%E5%B7%B2%E7%9F%A5%E4%B8%89%E4%B8%AA%E6%95%B0x+y+z%E6%BB%A1%E8%B6%B3xy%EF%BC%8F%28x%2By%29%EF%BC%9D-2%2Cyz%EF%BC%8F%28y%2Bz%29%EF%BC%9D4%EF%BC%8F3%2Czx%EF%BC%8F%28z%EF%BC%8Bx%29%EF%BC%9D-4%EF%BC%8F3%2C%E5%88%99xyz%EF%BC%8F%28xy%EF%BC%8Byz%EF%BC%8Bzx%29%E7%9A%84%E5%80%BC%E4%B8%BA%E5%A4%9A%E5%B0%91%E4%B8%A4%E8%BE%B9%E9%99%A4%E4%BB%A5%E4%BA%862%E5%BE%971%2Fx%2B1%2Fy%2B1%2Fz%3D-1%2F4%E5%90%8E%E5%92%8Cxyz%EF%BC%8F%28xy%EF%BC%8Byz%EF%BC%8Bzx%29%E6%98%AF%E4%BB%80%E4%B9%88%E5%85%B3%E7%B3%BB+%E6%88%91%E6%B2%A1%E7%9C%8B%E6%87%82+%E5%9C%A8%E7%BA%BF%E7%AD%89%E5%95%8A%21)
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急已知三个数x y z满足xy/(x+y)=-2,yz/(y+z)=4/3,zx/(z+x)=-4/3,则xyz/(xy+yz+zx)的值为多少两边除以了2得1/x+1/y+1/z=-1/4后和xyz/(xy+yz+zx)是什么关系 我没看懂 在线等啊!
急已知三个数x y z满足xy/(x+y)=-2,yz/(y+z)=4/3,zx/(z+x)=-4/3,则xyz/(xy+yz+zx)的值为多少
两边除以了2得1/x+1/y+1/z=-1/4后和xyz/(xy+yz+zx)是什么关系 我没看懂 在线等啊!
急已知三个数x y z满足xy/(x+y)=-2,yz/(y+z)=4/3,zx/(z+x)=-4/3,则xyz/(xy+yz+zx)的值为多少两边除以了2得1/x+1/y+1/z=-1/4后和xyz/(xy+yz+zx)是什么关系 我没看懂 在线等啊!
倒数 解方程组..
(x+y)/xy=1/x+1/y=-1/2
类推~~~