Bonjour J’ai besoin d’aide pour mon exercice de mathématiques S’il vous plaît Mercii

Réponse:

A = -1+4x(-1)-2+(-10)÷(-5)

= -1+(-4)-2+2

= -5

B = 7/5 + 6/2 x 2/3

= 7/5 + 6x2/2x3

= 7/5 + 12/6 ÷ 6

= 7/5 + 2/1 x 5

= 7/5 + 10/5

= 17/5

C = 5/7 - 2/7 ÷ (-3)

= 5/7 + 2/21

= 5/7 x 3 + 2/21

= 15/21 + 2/21

= 17/21