Exercice 2 :
On donne

A=\frac{ \frac{4}{7} -2 }{2- \frac{11}{14}}

B=25 times1034 times 10-8frac Diviser par 50 times 10-2timesfrac13


C=( \frac{2}{8}\cdot\frac{8}{15})\cdot(\frac{4}{7}\cdot\frac{5}{21})

Ecrire A sous forme de fraction irréductible
Donner l'écriture scientifique de B
Donner l'écriture décimale de C
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