(x+2/x^2-2x-x-1/x^2-4x+4)除以4-x/x2-4
问题描述：
(x+2/x^2-2x-x-1/x^2-4x+4)除以4-x/x2-4
答
=[(x+2)/x(x-2)-(x-1)/(x-2)²] ×(x+2)(x-2)/(4-x)
=[(x+2)(x-2)-x(x-1)]/x(x-2)² ×(x+2)(x-2)/(4-x)
=(x²-4-x²+x)/x(x-2)×(x+2)/(4-x)
=(x-4)/x(x-2)×(x+2)/(4-x)
=-(x+2)/x(x-2)