化简[(x的平方-4)/(x的平方-4X+4)-(2-X)/(X+2)]÷x/(x-2)
问题描述:
化简[(x的平方-4)/(x的平方-4X+4)-(2-X)/(X+2)]÷x/(x-2)
-8/(X-2)
B:8/(X-2)
C:-8/(X+2)
D:8/(X+2)
答
原式=[(x+2)(x-2)/(x-2)²+(x-2)/(x+2)]×[(x-2)/x]
=[(x+2)/(x-2)+(x-2)/(x+2)]×[(x-2)/x]
=[(x²+4x+4+x²-4x+4)/(x+2)(x-2)]×[(x-2)/x]
=(2x²+8)(x-2)/[x(x+2)(x-2)]
=(2x²+8)/(x²+2x)