x-2分之x－x+2分之x除以x-2分之4x,其中x=2012先化简再求值_数学解答

x-2分之x－x+2分之x除以x-2分之4x,其中x=2012先化简再求值

人气：157 ℃　时间：2020-04-14 12:37:45

解答

x-2分之x－x+2分之x除以x-2分之4x
=[x/(x-2)-x/(x+2)]÷4x/(x-2)
=(x²+2x-x²+2x)/(x-2)(x+2)÷4x/(x-2)
=4x/(x-2)(x+2)÷4x/(x-2)
=1/(x+2)
=1/(2012+2)
=1/2014