Bonsoir pourriez vous m'aidez svp merci d'avance

bonsoir

Exercice 1 

a = 32/15 + 4/5 
a = 32/15 + 12/15
a = 44/15

b = 2 - 3/4 * 6/5
b = 2 - 18/20
b = 40/20 - 18/20
b = 22/20 
b = 11/10

c = ( 1/2 + 4/3) / ( 1/3 - 2)
c = ( 3/6 + 8/6) / ( 1/3 - 6/3)
c = 11/6 * - 3/5
c = - 33/30
c= - 11/10

d = ( 3/4 + 7/5) * - 5/4
d = ( 15/20 + 28/20) * - 5/4
d = 43/20 * - 5/4
d = - 215/80 = - 43/16

E =  ( 1/4 + 2/3) + 5
E =  3/12 + 8/12 + 60/12
E = 71/12 

le 2 est simple

3. e = ( x -3)² + ( x - 3) ( 2 x + 5)

E = x² - 6 x + 9 + 2 x² + 5 x - 6 x - 15
E = 3 x² - 7 x - 6

E = ( x - 3) ( x - 3 + 2 x + 5)
e = ( x - 3) ( 3x + 2)

pour x = 4 

e =  1 * 14 = 14