1、两边乘以(x+2)(x-2)得
2x-4+2=3x+6
-x=8
∴x=-8
检验：x=-8是方程的解
2、 x=根号3+根号2/根号3-根号2,y=根号3-根号2/根号3+根号2
∴xy=1
x=5+2√6
y=5-2√6
∴x+y=10
x-y=4√6
x³-xy²/x四次方y+2x³y²+x²y³
=x(x+y)(x-y)/x²y(x+y)²
=(x-y)/xy(x+y)
=4√6/1×10
=2√6/5