Réponse :
bonjour,
9/(7+x ) = 7/5
7 × ( 7 + x ) = 9 × 5
49 + 7x = 45
7x = 45 - 49
7x = -4
x = -4/7
voila:)
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Réponse :
bonjour,
9/(7+x ) = 7/5
7 × ( 7 + x ) = 9 × 5
49 + 7x = 45
7x = 45 - 49
7x = -4
x = -4/7
voila:)