9-a^2/a^2+6a+9÷a^3-3a/a+3+1/a..算算吧

9-a^2/a^2+6a+9÷a^3-3a/a+3+1/a..算算吧
9-a^2/a^2+6a+9÷a^3-3a/a+3+1/a
..算算吧

9-a^2/a^2+6a+9÷a^3-3a/a+3+1/a..算算吧
原式=-(a+3)(a-3)/(a+3)²÷[a(a-3)/(a+3)]+1/a
=-(a-3)/(a+3)×[(a+3)/a(a-3)]+1/a
=-1/a+1/a
=0

原始=8+6a+9÷a^3+1/a原始=8+6a+9÷a^3+1/a原始=8+6a+9÷a^3+1/a原始=8+6a+9÷a^3+1/a原始=8+6a+9÷a^3+1/a原始=8+6a+9÷a^3+1/a原始=8+6a+9÷a^3+1/a原始=8+6a+9÷a^3+1/a