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Sagot :

LOULAKAR

bonjour

Calculer sous la forme la plus simple :

A = (1/4 - 1/5) x (7 + 37/9)

A = [(1 x 5)/(4 x 5) - (1 x 4)/(5 x 4)] x [(7 x 9)/9 + 37/9]

A = (5/20 - 4/20) x (63/9 + 37/9)

A = 1/20 x 100/9

A = 100/20 x 1/9

A = (20 x 5)/20 x 1/9

A = 5 x 1/9

A = 5/9

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