化简式子(数学)

问题描述:

化简式子(数学)
[a-1+2/(a+1)]+(a^2+1)

原式=[(a-1)(a+1)+2]/(a+1)+(a²+1)
=(a²+1)/(a+1)+(a²+1)
=(a²+1)[1/(a+1)+1]
=(a²+1)(a+2)/(a+1)