effectuer les calculs suivant attention aux priorités -7+3*(-5)          -11-2*15             38-(-4)*(-11) (-4+5)*3            -18-3*(-7)           (13-15)*(-4

-7+3x(-5)=-7+(-15)=-7-15=-22
-11-2x15=-11-30=-41
38-(-4)x(-11)=38-(44)=38-44=-6
(-4+5)x3=1x3=3
-18-3x(-7)=-18-(-21)=-18+21=3
(13-15)x(-4)=-2x-4=8

A = 1+(1+3/5)
   =1+(5/5+3/5)
  =1+8/5=5/5+8/5=13/5
B = (1+1/3)+(1-1/3)
   =(3/3+1/3)+(3/3-1/3)
   =4/3+2/3=6/3=2
C = A/B
   = 13/5 : 2
   =13/10

Exercice 01 :

A = - 7 + 3 x (-5)
A = - 7 - 15
A = - 22

B = - 11 - 2 x 15
B = - 11 - 30
B = - 41

C = 38 - (- 4) x (- 11)
C = 38 - (- 4 x - 11)
C = 38 - (4 x 11)
C = 38 - 44
C = -6

D = (- 4 + 5) x 3  
D = 1 x 3
D = 3

E = - 18 - 3 x (- 7)
E = - 18 + 21
E = 3

F =  (13 - 15) x (- 4) 
F = - 2 x (- 4)
F = 8

Exercice 02 :

A = 1 + (1 + 3/5) 
A = 1 + 1 + 3/5
A = 2 + 3/5
A = 10/5 + 3/5
A = 13/5
A = 2,6

B = (1 + 1/3) + (1 - 1/3) 
B = 1 + 1/3 + 1 - 1/3
B = 1 + 1 + 1/3 - 1/3
B = 2 + 0
B = 2

C = A/B
C = 2,6/2
C = 1,3

OU :

C = A/B
C = (13/5):2
C = 13/5 x 1/2
C = 13/10
C = 1,3