x=√3-√2,y=√3+√2①x²y-xy²=xy(x-y)=(√3-√2)(√3+√2)(√3-√2-√3-√2)=(3-2)(-2√2)=-2√2②x²+2xy+y² =(x+y)²=(√3-√2+√3+√2)²=(2√2)²=8③（y/x）-（x/y）=(y²...