bonjour pouvez-vous maider svp ? calcul en detaillant les etapes et donne sous la forme la plus simple possible : A=7-6*5/14 B=7/6-3/5*10 C=2/5-2/5÷4/7 D=(3/4-8

Bonjour,

A=7-6*5/14

A = 7 - 30/14

A = (7 x 14) / (1 x 14) - 30/14

A = 98/14 - 30/14

A = 68/14

A = (2 x 34) / (2 x 7)

A = 34/7

B=7/6-3/5*10

B = 7/6 - 30/5

B = (7 x 5) / (6 x 5) - (30 x 6) / (5 x 6)

B = 35/30 - 180/30

B = - 145/30

B = (5 x - 29) / (5 x 6)

B = - 29/6

C=2/5-2/5÷4/7

C = 2/5 - 2/5 x 7/4

C = 2/5 - 14/20

C = (2 x 4) / (5 x 4) - 14/20

C = 8/20 - 14/20

C = 6/20

C = (2 x 3) / (2 x 10)

C = 3/10

D=(3/4-8/7)÷(7/2-9/5)

D = [(3 x 7) / (4 x 7) - (8 x 4) / (7 x 4)] : [(7 x 5) / (2 x 5) - (9 x 2) / (5 x 2)]

D = (21/28 - 32/28) : (35/10 - 18/10)

D = - 11/28 : 17/10

D = - 11/28 x 10/17

D = - 110/476

D = (2 x - 55) / (2 x 238)

D = - 55/238