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Answered

Détaillée et donner le résultat sous forme de fraction irréductible

1 A=4/5-1/2 ÷7/4
B=21/75*5/3

Merci d’avance !

Sagot :

MAUDMARINE

Bonsoir

1 A=4/5-1/2 ÷7/4

A = 4/5 - 1/2 x 4/7

A = 4/5 - 4/14

A = (4 x 14) / (5 x 14) - (4 x 5) / (14 x 5)

A = 56/70- 20/70

A = 36/70

A = (2 x 18) / (2 x 35)

A = 18/35

B=21/75*5/3

B = 105/225

B  = (15 x 7) / (15 x 15)

B = 7/15.

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