⚫ Soit la arithmétique de raison et de premier terme : .
ⓐ. Exprimons pour tout entier naturel .
On sait que :
On a :
•
Alors :
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ⓑ. Calculons et .
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☺ Salut ☺
⚫ Soit
la arithmétique de raison
et de premier terme :
.
ⓐ. Exprimons
pour tout entier naturel
.
On sait que
:
On a :
•
•
Alors :
✔
✔️
ⓑ. Calculons
et
.
✅
✅
•
•
•
•
✔
✔
••••••••••••••••••••
•
•
•
✔
✔