1/х - у) (х - 1/у) ^-1 = ((1-ху) /х) ((ху-1)/у) ^-1 = ((1-ху) /х) (у/(ху-1)) = - ((ху-1)у) /(х (ху-1)) = -у/х
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1/х - у) (х - 1/у) ^-1 = ((1-ху) /х) ((ху-1)/у) ^-1 = ((1-ху) /х) (у/(ху-1)) = - ((ху-1)у) /(х (ху-1)) = -у/х