是想要求a,b吧?a²*b²+a²+b²+1=4ab(a²b²+1-2ab)+(a²+b²-2ab)=0(ab-1)²+(a-b)²=0∵(ab-1)²≥0,(a-b)²≥0∴ab-1=0,a-b=0∴a=b=1