已知x/1-y/1=3,求:3x+xy-3y/x-y-xy的值额………………sorry,应该是1/x-1/y=3!
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![已知x/1-y/1=3,求:3x+xy-3y/x-y-xy的值额………………sorry,应该是1/x-1/y=3!](/uploads/image/z/1248341-5-1.jpg?t=%E5%B7%B2%E7%9F%A5x%2F1-y%2F1%3D3%2C%E6%B1%82%EF%BC%9A3x%2Bxy-3y%2Fx-y-xy%E7%9A%84%E5%80%BC%E9%A2%9D%E2%80%A6%E2%80%A6%E2%80%A6%E2%80%A6%E2%80%A6%E2%80%A6sorry%EF%BC%8C%E5%BA%94%E8%AF%A5%E6%98%AF1%2Fx-1%2Fy%3D3%21)
已知x/1-y/1=3,求:3x+xy-3y/x-y-xy的值额………………sorry,应该是1/x-1/y=3!
已知x/1-y/1=3,求:3x+xy-3y/x-y-xy的值
额………………sorry,应该是1/x-1/y=3!
已知x/1-y/1=3,求:3x+xy-3y/x-y-xy的值额………………sorry,应该是1/x-1/y=3!
已知条件不对吧?
∵x/1-y/1=3
∴y-x=3xy
3x+xy-3y/x-y-xy
=[3(x-y)+xy]/[(x-y)-xy]
=9xy+xy/3xy-xy
=10xy/2xy
=5/1