Sagot :
Bonsoir,
Diviser une fraction revient à multiplier son contraire,
Donc,
A = 5 : 3/4
A = 5 x 4/3
A = 5x4/1x3
A = 20/3
B = 1 : 7/12
B = 1 x 12/7
B = 1x12/1x7
B = 12/7
C = 13/11 : 6
C = 13/11 x 1/6
C = 13x1/11x6
C = 13/66
D = 1/4 : (-2)
D = 1/4 x (-1/2)
D = - 1x1/ 4x2
D = - 1/8
Bonne soirée.