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.