Calculer chacune des expressions suivantes et donner le résultat sous forme de fraction irréductible A = 7/4 - 3/4 fois 2/7 B = ( 1 - 3/4 ) ( 2 + 3/5 ) C = ( 2/

Bonsoir '

A = 7/4 - 3/4 x 2/7

A = 7/4 - 6/28

A = 7x7/4x7 - 6/28

A = 49/28 - 6/28

A = 43/28

B = (1-3/4)(2+3/5)

B = (4/4-3/4)(10/5+3/5)

B = (1/4)(7/5)

B = 7/20

C = (2/3-3/4)/(4/5-2/3)

C = (8/4+3/4)/(12/15-10/15)

C = (5/4)/(2/15)

C = 75/8

Bon courage.