18、a+1/a=3,则a^2+1/a^2=______; (a-1/a)^2=______.18、a+1/a=3,则a^2+1/a^2=______;(a-1/a)^2=______.

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18、a+1/a=3,则a^2+1/a^2=______;(a-1/a)^2=______.18、a+1/a=3,则a^2+1/a^2=______;(a-1/a)^2=______.18、a+1/a

18、a+1/a=3,则a^2+1/a^2=______; (a-1/a)^2=______.18、a+1/a=3,则a^2+1/a^2=______;(a-1/a)^2=______.
18、a+1/a=3,则a^2+1/a^2=______; (a-1/a)^2=______.
18、a+1/a=3,则a^2+1/a^2=______;
(a-1/a)^2=______.

18、a+1/a=3,则a^2+1/a^2=______; (a-1/a)^2=______.18、a+1/a=3,则a^2+1/a^2=______;(a-1/a)^2=______.