原式=[(x+2)/x(x-2)-(x-1)/(x-2)²]×x/(x-4)
=[(x+2)(x-2)-x(x-1)]/x(x-2)² ×x/(x-4)
=(x²-4-x²+x)/(x-2)² ×1/(x-4)
=1/(x-2)²
当x=-3时
原式=1/(-3-2)²=1/25
原式=[(x+2)/x(x-2)-(x-1)/(x-2)²]×x/(x-4)
=[(x+2)(x-2)-x(x-1)]/x(x-2)² ×x/(x-4)
=(x²-4-x²+x)/(x-2)² ×1/(x-4)
=1/(x-2)²
当x=-3时
原式=1/(-3-2)²=1/25