Mate idk dau coroana si 100 de pct
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Răspuns:
2.
a)
a₁ = (1 + 2) / 1 = 3
a₂ = (2 + 2) / 2 = 2
a₃ = (3 + 2) / 3 = 5/3
a₄ = (4 + 2) / 4 = 6/4 = 3/2
a₅ = (5 + 2) / 5 = 7/5
c)
a₁ = (-1)¹ / 2·1 = -1/2
a₂ = (-1)² / 2·2 = 1/4
a₃ = (-1)³ / 2·3 = -1/6
a₄ = (-1)⁴ / 2·4 = 1/8
a₅ = (-1)⁵ / 2·5 = -1/10
d)
a₁ = (1 + 1) · √3 = 2√3
a₂ = (2 + 1) · √3 = 3√3
a₃ = (3 + 1) · √3 = 4√3
a₄ = (4 + 1) · √3 = 5√3
a₅ = (5 + 1) · √3 = 6√3
e)
a₁ = √(2·1) = √2
a₂ = √(2·2) = √4 = 2
a₃ = √(2·3) = √6
a₄ = √(2·4) = 2√2
a₅ = √(2·5) = √10
3.
a)
[tex]a_{2} =\frac{1}{a_{1}} =\frac{1}{\frac{1}{5} } =5[/tex]
a₃ = 1 / a₂ = 1 / 5
a₄ = 1 / a₃ = 5
a₅ = 1 / a₄ = 1 / 5
b)
a₂ = √(2·a₁) = √(2·2) =√4 = 2
a₃ = √(2·a₂) = √(2·2) = 2
a₄ = √(2·a₃) = √(2·2) = 2
a₅ = √(2·a₄) = √(2·2) = 2
c)
a₂ = - a₁ + 1 = -3 + 1 = -2
a₃ = - a₂ + 1 = 2 + 1 = 3
a₄ = - a₃ + 1 = -3 + 1 = -2
a₅ = - a₄ + 1 = 2 + 1 = 3
d)
a₃ = a₂ + a₁ = 3 + 2 = 5
a₄ = a₃ + a₂ = 5 + 3 = 8
a₅ = a₄ + a₃ = 8 + 5 = 13
4.
a₁ = 1² - 5 = -4
a₂ = 2² - 5·2 = 4 - 10 = -6
a₃ = 3² - 5·3 = 9 - 15 = -6
a₄ = 4² - 5·4 = 16 - 20 = -4
a₅ = 5² - 5·5 = 0
a₆ = 6² - 5·6 = 36 - 30 = 6
a) a₅ = 0
b) a₆ = 6
c) a₄ = a₁
d) a₂ = a₃
Explicație pas cu pas: