Răspuns :
Salut,
a+1/a = 5/2 /²
(a+1/a)² = (5/2)²
a²+2+1/a² = 25/4
a²+1/a² = 25/4-8/4
a²+1/a² = 17/4.
Succes! :3
a+1/a = 5/2 /²
(a+1/a)² = (5/2)²
a²+2+1/a² = 25/4
a²+1/a² = 25/4-8/4
a²+1/a² = 17/4.
Succes! :3
a + 1/a = 5/2 | ()²
a² + 2*a*1/a + 1/a² = 25/4
a² + 1/a² = 25/4 - 2 = (25-8)/4 = 17/4 (A)
a² + 2*a*1/a + 1/a² = 25/4
a² + 1/a² = 25/4 - 2 = (25-8)/4 = 17/4 (A)