Answered

Calculer A et B et écrire la réponse sous la forme d’une fraction irréductible

A=1/3-1/3x4/7
B= 6/5:(1/15-1/5)

Sagot :

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a)

A = 1/3 - 1/3 * 4 / 7

A = 1/3 - 4/21

A = 1x 7/3 x 7 - 4/21

A = 7/21 - 4/21

A = 3/21

A = 3 x 1/3 x 7

A = 1/7

b)

B = 6/5 / (1/15 - 1/5)

B = 6/5(1/15 - 1 x 3/5 x 3) B = 6/5 / (1/15 - 3/15)

B = 6/5 / - 2 / 15 B = 6/5 * - 15 / 2

B = - 90/10

B = 10 x 9/ 10 x 1

B = - 9