Bonsoir, pouvez-vous m'aider svp ¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤¤ Compléter. a. 3/7 × ... = 21/21 b. 3/7 × ... = 1 c. 4/5 × ... = 1 d. 11/6 × ... = 1​

Bonjour

Compléter.

a. 3/7 × 7/3 = 21/21

b. 3/7 ×  7/3= 1

c. 4/5 × 5/4 = 1

d. 11/6 × 6/11 = 1​

Réponse :

Explications étape par étape

Bonjour

Compléter.

a. 3/7 × ... = 21/21

... = 21/21 / 3/7

... = 21/21 x 7/3

... = 21/3 x 7/21

... = 7 x 1/3

... = 7/3

3/7 x 7/3 = 21/21

b. 3/7 × ... = 1

... = 1 / (3/7)

... = 1 x 7/3

... = 7/3

3/7 x 7/3 = 1

c. 4/5 × ... = 1

... = 1 / (4/5)

... = 1 x 5/4

... = 5/4

4/5 x 5/4 = 1

d. 11/6 × ... = 1​

11/6 x 6/11 = 1