Réponse :
bonjour
A/
3² = 9
3⁵ = 243
3⁷ = 2 187
3⁻² = 1/9
3¹² = 531 441
3¹⁴ = 4 782 969
B/
3 ² x 3 ⁵ = 3 ⁷
3⁷ x 3 ⁻² = 3 ⁵
3¹² x 3 ² = 3 ¹⁴
3 ⁷/3² = 3 ⁵
( 3⁷)² = 3 ¹⁴
3 ² x 3 ⁵ = 3 ²⁺⁵ donc on les additionne
(3⁷)² = 3 ¹⁴ on les multiplie
3⁷/3² = 3 ⁵ on les soustrait