∵4x²-y²=0∴y=±2x∵当y=2x时,代入x²-xy-3=0得x²+3=0,则无解当y=-2x时,代入x²-xy-3=0得3x²-3=0 ==>x=±1则解是x=1,y=-2或x=-1,y=2∴原方程组的解是x=1,y=-2或x=-1,y=2....