X²-XY+2X=O提公因数X即X（X-Y+2）=0则X=0或X-Y+2=0假如X=0那么代入X²-2XY+Y+8=0解得Y=﹣8即X=0 Y=﹣8假如X≠0则X-Y+2=0即X=Y-2代入X²-2XY+Y+8=0得Y²-Y-12=0解得Y=﹣3或Y=4若Y=4则X=2若Y=﹣3则X=...