若1/x-1/y=2 xy/x方-y方的值为几?

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若1/x-1/y=2xy/x方-y方的值为几?若1/x-1/y=2xy/x方-y方的值为几?若1/x-1/y=2xy/x方-y方的值为几?由1/x-1/y=2得(y-x)/xy=2y-x=2xyxy/

若1/x-1/y=2 xy/x方-y方的值为几?
若1/x-1/y=2 xy/x方-y方的值为几?

若1/x-1/y=2 xy/x方-y方的值为几?
由1/x-1/y=2得(y-x)/xy=2 y-x=2xy
xy/(x²-y²)==xy/[(x+y)(x-y)]=-xy/[(x+y)(y-x)]=-xy/[2xy(x+y)]=-1/[2(x+y)]