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Sagot :

Explications étape par étape:

A = 2/7 - 3/7 × 14/9

on commence par la multiplication

A = 2/7 - (3×14) / (7×9)

A= 2/7 - 42/63

A = (2×9)/(7×9) - 42/63

A = 18/63 - 42/63

A = (18-42) /63

A = -24/63

A = -(3×8)/(3×21)

A= -8/21

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