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Sagot :

Réponse :

Explications étape par étape :

A=-4/7×5/6×-3/7

A =- (2X2X5X3) / (7 X 2X3X7)

A =-  10 / 49

B=(5/8-7/6)×(8/5- -3/35)

B= (15/24-28/24) X (56/35 - 3 /35)

B = (-13/24) X (53/35)

B = - 689 / 840

C=35/-42×63/50

C = - (7 X 5 X 7 X 3 X 3) / (7 X 3 X 2 X 5 X 10)

C = - (7 X 3) / 2 X 10)

C = - 21 / 20

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