⑴ a？ +a negative square

⑵a？ Party +A negative? square

⑶a？ -Negative two sides

⑷a？ -Negative tripartite

Solution: obtained from the known A+A- 1 = 3.

⑴a？ +a^-2 =a？ + 1/a？ =(a+ 1/a)？ -2=9-2=7.

⑵a？ Party +A negative? square

=a^0.5+a^-0.5

Pass (√ a+1√ a)? =(a+ 1/a)-2=3-2= 1，

Get a 0.5+a-0.5 =1.a0.5+a-0.5 =-1(discard).

Answer? Party +A negative? square

=a^0.5+a^-0.5 = 1。

⑶a？ -a^-2 =a？ + 1/a？ =(a- 1/a)？ +2=9+2= 1 1.

⑷ a？ +a^-3

=(a+ 1/a)(a？ - 1+ 1/a？ )

=3*(7- 1)

= 18.