计算:(1)(a/a^2-1)+(3a+1/a^2-1)+(2a+3/1-a^2)

问题描述:

计算:(1)(a/a^2-1)+(3a+1/a^2-1)+(2a+3/1-a^2)

(a/a^2-1)+(3a+1/a^2-1)+(2a+3/1-a^2)
=(a+3a+1-2a-3)/(a^2-1)
=2(a-1)/(a^2-1)
=2(a-1)/(a-1)(a+1)
=2/(a+1)