aider moi svp A= racine 8 + 7 racine2 B=racine5-racine20 C=2racine 3 - racine75 D=3racine44- 4racine99 SVP

a = √8 + 7√2 = √2 x 2² + 7√2 = 2√2 + 7√2 = 9√2

b) √5 - 5√20 = √5 - 5 √5 x 2² = √5 - 2√5 = - √5

c) 2√3 - √75 = 2√3 - √3 x 5² = 2√3 - 5√3 = - 3√3

d) 3√44 - 4√99 = 3√ 11 x 2² - 4 √11 x 3² = 6√11 - 12√11 = - 6√11