(1+x-2分之1）÷2x-4分之x方-1 其中 x=3
问题描述：
(1+x-2分之1）÷2x-4分之x方-1 其中 x=3
答
原式=[1+1/(x-2)]/{[(x+1)(x-1)]/2(x-2)}
=[2x-4+2]/[(x+1)(x-1)]
=2[x-1]/[(x+1)(x-1)]
=2/(x+1)
=2/(3+1)
=1/2