化简:(X²-2XY+Y²-1)/(X-Y-1)如题.

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化简:(X²-2XY+Y²-1)/(X-Y-1)如题.化简:(X²-2XY+Y²-1)/(X-Y-1)如题.化简:(X²-2XY+Y²-1)

化简:(X²-2XY+Y²-1)/(X-Y-1)如题.
化简:(X²-2XY+Y²-1)/(X-Y-1)
如题.

化简:(X²-2XY+Y²-1)/(X-Y-1)如题.
(X²-2XY+Y²-1)/(X-Y-1)=[(X-Y)²-1]/(X-Y-1) =(X-Y-1)(X-Y+1)/(X-Y-1)=X-Y+1