Bonsoir
Penser à simplifier l'un des termes, puis calculer.
A=-20÷12-2÷3
A = -20/12 - 2/3
A = (-5 x 4)/(3 x 4) - 2/3
A = -5/3 - 2/3
A = -7/3
B=-5÷20+7÷-4
B = -5/20 - 7/4
B = -5/(5 x 4) - 7/4
B = -1/4 - 7/4
B = -8/4
B = -2
C=7÷9-56÷12
C = 7/9 - 56/12
C = 7/9 - (4 x 14)/(4 x 3)
C = 7/9 - 14/3
C = 7/9 - (14 x 3)/(3 x 3)
C = 7/9 - 42/9
C = (-35/9)
D=-2÷9-25÷45
D = -2/9 - 25/45
D = -2/9 - (5 x 5)/(9 x 5)
D = -2/9 - 5/9
D = -7/9
