Calculer et donner les résultats sous forme de fractions irréductibles A= 2/3 - 7/3 X 9/14 B= 2/7 + 5/21 LE TOUT SUR 5/9 - 1/3 C= (4-1/3) + 5/4 D= 3/8 + 5/8 Div

 A = 2/3 - 7/3 x 9/14
A = 2/3 - (7 x 3 x 3)/(3 x 2 x 7)
A = 2/3 - 3/2
A = 4/6 - 9/6
A = - 5/6

B = (2/7 + 5/21) / (5/9 - 1/3)
B = (6/21 + 5/21) / (5/9 - 3/9)
B = 11/21 / 2/9
B = 11/21 x 9/2
B = 99/42
B = 33/14

C = (4 - 1/3) + 5/4
C = (12/3 - 1/3) + 5/4
C = 11/3 + 5/4
C = 44/12 + 15/12
C = 59/12

D = 3/8 + 5/8 / (2/3 + 1/6)
D = 3/8 + 5/8 /(4/6 + 1/6)
D = 3/8 + 5/8 / 5/6
D = 3/8 + 5/8 x 6/5
D = 3/8 + 6/8
D = 9/8

A= 2/3 - (7/3 x 9/14)
A= 2/3 - (7/1 x 3/14)
A= 2/3 - (1/1 x 3/2)
A= 2/3 - (1 x 3/2)
A= 2/3 - 3/2
A= 4/6 - 9/6
A= (4 - 9)/6
A=  - 5/6


B= ( 2/7 + 5/21) / (5/9 - 1/3)
B= ( 6/21 + 5/21) / (5/9 - 3/9)
B= ( 11/21) / (2/9)
B=  11/21 x 9/2
B=  11/21 x 9/2
B=  11/7 x 3/2
B=  33/14


C= (4 -1/3) + 5/4
C= (12/3 -1/3) + 5/4
C= (11/3) + 5/4
C= 44/12 + 15/12
C= 59/12


D= 3/8 + (5/8 /(2/3 + 1/6))
D= 3/8 + (5/8 /(4/6 + 1/6))
D= 3/8 + (5/8 /(5/6))
D= 3/8 + (5/8 x 6/5)
D= 3/8 + (1/8 x 6/1)
D= 3/8 + (1/4 x 3/1)
D= 3/8 + 3/4
D= 3/8 + 6/8
D= 9/8