a+1/a=3
(a+1/a)²=3²
(a²+2×a×1/a+(1/a)²)=9
a²+2+1/a²=9
a²+1/a²=9-2
a²+1/a²=7
a⁴+1/a²=7
Ответ: 7
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a+1/a=3
(a+1/a)²=3²
(a²+2×a×1/a+(1/a)²)=9
a²+2+1/a²=9
a²+1/a²=9-2
a²+1/a²=7
a⁴+1/a²=7
Ответ: 7