化简1/a-2+1/a^-4的结果是
问题描述：
化简1/a-2+1/a^-4的结果是
答
1/a-2+1/a^-4
=(a+2）/（a^2-4) +1/a^-4
=(a+3）/（a^2-4)
答
1/a-2+1/a^-4
=1/a-2 +1/(a-2)(a+2=(a+2)/(a-2)(a+2)+1/(a-2)(a+2)=a+3/(a-2)(a+2)