原式=[(x+2)(x-2)/(x-2)²-(x-2)/(x+2)]/x*1/(x-2)
=[(x+2)/(x-2)-(x-2)/(x+2)]*1/x(x-2)
=(x²+4x+4-x²+4x-4)/(x+2)(x-2)*1/x(x-2)
=8/(x+2)(x-2)²