a2-1/a2+a-2÷(1+1/a2+2a)化简
问题描述：
a2-1/a2+a-2÷(1+1/a2+2a)化简
答
原式=(a+1)(a-1)/(a+2)(a-1)÷(a²+2a+1)/(a²+2a)
=(a+1)/(a+2)×a(a+2)/(a+1)²
=a/(a+1)