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Sagot :

Bonjour,

1. Un = 25n donc U2 = 25 × 2 = 50

2. Un = (n + 3)^2 donc U2 = (3 + 2)^2 = 5^2 = 25

3. U(n + 1) = 10 × (Un + 1) et U1 = 1,5

Donc U2 = 10 × (U1 + 1) = 10 × (1,5 + 1) = 10 × 2,5 = 25

4. U(n + 1) = 60 - 5Un et U1 = 2

Donc U2 = 60 - 5U1 = 60 - 5 × 2 = 60 - 10 = 50

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