Bonjour
A=72+(-3)× -1/3
A = 72 + 3/3
A = 72 + 1
A = 73
B= -9/8 -5 ÷ -3/8 -10
B = - 9/8 - 5 x - 8/3 - 10
B = - 9/8 + 40/3 - 10
B = (- 9 x 3) / (8 x 3) + (40 x 8) / (3 x 8) - (10x 24) / (1 x 24)
B = - 27/24 + 320/24 - 240/24
B = 53/24
C= -5/3 ×(-10/3 + -7/4)
C = - 5/3 x [(- 10 x 4) / (3 x 4) - (7 x 3) / (4 x 3)]
C= -5/3 x (- 40/12 - 21/12)
C = - 5/3 x - 61/12
C = - 5/3 x - 12/61
C = 60/183
C = (3 x 20) / (3 x 61)
C = 20/61.
