Réponse :bONJOUR.
3. a. 11/9 > 8/9
b. -14 * 12 / 9* 12 = -168 / 108
Ensuite -19*9 / 12 * 9 = -171 / 108
Donc -19 / 12 < -14/9
Exercice 2
A= 7 +5 / 16 = 12/16 = 4*3 / 4*4 = 3/4 = A
B = -5/2 - 4/2 = -5-4/2 = -9 / 2 = B
C = 4*2 / 13*2 + 5/26 = 8 +5 / 26 = 13 / 26 = 1/2 = C
D= 2*4 / 25 * 4 + 9* 5 / 20 * 5 = 8 / 100 + 45/100 = 53 / 100 = D
E = 4 * 7 / 5*7 - 6 * 5 / 7*5 = 28 / 35 - 30/ 35 = -2/35=E
F= 3/55 - 5/11 + 7/10 = 3/55 - 5*5 / 11*5 + 7/10 = 3 - 25 / 55 + 7/10 = - 11*2 / 11 * 5 + 7/10 = -2/5 + 7/10 = -4/10 +7/10 = 3 /10