a+a^-1=a+1/a=3.
a²+a^-2=a²+1/a²=a²+(1/a)²=(a+1/a)²-2(a•1/a)=(a+1/a)²-2=3²-2=9-2=7.
Ответ: 7.
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a+a^-1=a+1/a=3.
a²+a^-2=a²+1/a²=a²+(1/a)²=(a+1/a)²-2(a•1/a)=(a+1/a)²-2=3²-2=9-2=7.
Ответ: 7.