Sagot :
E=5racine(9*5)-3racine(4*5)=5*3racine(5)-3*2racine(5)=15racine(5)-6racine(5)=9racine(5)
H=(racine(2)-3)(1+3racine(2))=racine(2)+3*2-3-9racine(2)=-8racine(2)+3
EXO 3:
G= rac5^2 -6rac5 +3^2
=5 -6rac5 +9
= 14 -6rac5
H= rac2 +6 -3 -9rac2
= 3-8rac2
I: rac7^2 + 2rac14 + rac2^2
= 7 +2rac14 + 2
= 9 + 2rac14
J: (3rac2)^2 - (1)^2