Răspuns:
Explicație pas cu pas:
f)
6/(3ⁿ⁺¹) = 2/9
2 x 3ⁿ⁺¹ = 9 x 6 l : 2
3ⁿ⁺¹ = 3² x 3
3ⁿ⁺¹ = 3²⁺¹ => n + 1 = 3 => n = 3 - 1 => n = 2
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g)
1/2 = 5ⁿ⁺²/50
2 x 5ⁿ⁺² = 50 l : 2
5ⁿ⁺² = 25
5ⁿ⁺² = 5² => n + 2 = 2 => n = 2 - 2 => n = 0
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h)
2/98 = 1/7ⁿ⁻¹
2 x 7ⁿ⁻¹ = 98 l : 2
7ⁿ⁻¹ = 49
7ⁿ⁻¹ = 7² => n - 1 = 2 => n = 2 + 1 => n = 3
