x²+√2y=√3……①y²+√2x=√3……②①式减②式x²-y²-√2(x-y)=√3(x+y)(x+y)=√2(x-y)……③∵x不等于y∴x-y≠0∴③式可得x+y=√2①式加②式x²+y²+√2(x+y)=2√3(x+y)²-2xy+√2...