29 Calculer mentalement A=4x (50-30) C = 4+ (3+2) × 7 : B= (6+4) x2+7 D= (24÷2)÷(18+3)

bonjour,

A=4x (50-30)

4*20 = 80

C = 4+ (3+2) × 7

4+5*7 = 4+35

= 39

B= (6+4) x2+7

= 10*2 +7

= 20+7 = 27

D= (24÷2)÷(18+3)

=12/21

= 4/7

Bonjour,

N'oublies pas la formule de politesse la prochaine fois ;)

A=4x (50-30)

A = 4x 20

A = 80

C = 4+ (3+2) × 7

C = 4 + 5 x 7

C = 4 + 35

C = 39

B= (6+4) x2+7

B = 10 x 2 +7

B = 20 + 7

B = 27

D= (24÷2)÷(18+3)

D = 12 : 21

D = 12/21

Bonne journée.