2х + 1/х = 7
(2х + 1/х)² = 49
4х² + 2·2х · 1/х + 1/х² = 49
4х² + 4 +1/х² + 49
4х² + 1/х² = 45
Ответ: 45
(2x+(1/x))=7
(2x+(1/x))²=7²
(2x)²+2*(2x)*(1/x)+(1/x)²=49
4x²+4+(1/x²)=49
4x²+(1/x²)=45.
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Answers & Comments
2х + 1/х = 7
(2х + 1/х)² = 49
4х² + 2·2х · 1/х + 1/х² = 49
4х² + 4 +1/х² + 49
4х² + 1/х² = 45
Ответ: 45
(2x+(1/x))=7
(2x+(1/x))²=7²
(2x)²+2*(2x)*(1/x)+(1/x)²=49
4x²+4+(1/x²)=49
4x²+(1/x²)=45.