先化简再求值（x-y/1-x+y/1）÷x平方+2xy+y平方/2y,其中x=根号3+根号2,y=根号3-根号2 写的详

x=根号3+根号2,y=根号3-根号2∴x+y=2√3x-y=2√2[1/(x-y)-1/(x+y)]÷2y/(x平方+2xy+y平方) 你的分子分母写的颠倒了=[(x+y)-(x-y)]/(x+y)(x-y)×(x+y)²/2y=(x+y)/(x-y)=2√3/2√2=√6/2