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Sagot :

Réponse :

a. 3/7 x 5/4 = 3x5/7x4 =15/18

b. 6/11 x 4/5 = 6x4/11x5 = 24/55

c. 11/9 x 2/1 = 11x2/9x1 = 22/9

d. 15/4 x 1/2 = 15x1/4x2 = 15/8

e. 4 x 7/9 = 4x7/9 = 28/9

f. 3/9 x 7/5 = 3x7/9x5 = 21/45

bonjour

a. 3/7 : 4/5 = 3/7 * 5/4 = 15/28

b. 6/11 : 5/4 = 6/11 * 4/5 = 24/55

c. 11/9 : 1/2 = 11/9 * 2/1 = 22/9

d. 15/4 : 2 = 15/4 : 2/1 = 15/4 * 1/2 = 15/8

e. 4 : 7/9 = 4/1 : 7/9 = 4/1 * 9/7 = 36/7

f. 3/8 : 5/7 = 3/8 * 7/5 = 21/40

tous simplement pour obtenir le quotient de deux fraction il suffit de multiplier la 1er fraction par l'inverse de la 2e

autrement dit :

a/b : c/d = a/b * d/c = ad/bc

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