Les reponses svppp merci d'avance ​

Réponse:

exercice 2:

a) 4² = 16

b) 8² = 64

c) 3² + 9² = 9 + 81 = 90

exercice 3:

A) 19² + 4,7² = 361 + 22,09 = 383,09

B) 6,9² + 11,01² = 47,61 + 121,2201 = 168,8301

C) 4,75² - 3,1² = 22,5625 - 9,61 = 12,9525

D) 60² - 30² = 3600 - 900 = 2700