计算8/a^2-4+3/2-a

问题描述:

计算8/a^2-4+3/2-a


8/(a²-4)+3/(2-a)
=8/(a-2)(a+2)-3/(a-2)
=8/(a-2)(a+2)-3(a+2)/(a-2)(a+2)
=(8-3a-6)/(a²-4)
=(-3a+2)/(a²-4)