Answered

calculer en simplifiant si possible et vérifier avec la calculatrice

A= 2/7-3/7×14/9

B= -7/8×(2/3-1)

C=4/5×1/4+2/5

Aider moi svp ​

Sagot :

MAUDMARINE

Bonjour

Calculer en simplifiant si possible et vérifier avec la calculatrice

A= 2/7-3/7×14/9

A = (2 x 9) / (7 x 9) - 42/63

A = 18/63 - 42/63

A = - 24/63

A = (3 x - 8) / (3 x 21)

A = - 8/21.

B= -7/8×(2/3-1)

B = - 7/5 x [2/3 - (1 x 3) / (1 x 3)]

B = - 7/5 x (2/3 - 3/3)

B = - 7/5 x (- 1/3)

B = 21/15

B = (3 x 7) / (3 x 5)

B = 7/5

C=4/5×1/4+2/5

C = 4/20 + (2 x 4) / (5 x 4)

C = 4/20 + 8/20

C = 12/20

C = (4 x 3) / (4 x 5)

C = 3/5.

DALALTHECLEVEREST

Bonjour :)

Réponse en explications étape par étape :

- Question : Calculer en simplifiant :

A = 2/7 - 3/7 * 14/9

A = 2/7 - [(3 * 1) / (7 * 1)] * [(7 * 2) / (3 * 3)]

A = 2/7 - 2/3

A = (2 * 3 - 2 * 7) / (3 * 7)

A = (6 - 14) / 21

A = - 8/21

B = - 7/8 * (2/3 - 1)

B = - 7/8 * - 1/3

B = 7/24

C = 4/5 * 1/4 + 2/5

C = 1/5 + 2/5

C = 3/5

Voilà