Réponse :
bonjour
2 x = 7.61
x = 3.805
x - 2.7 = 3.405
x = 3.405 + 2.7
x = 6.105
3 x - 2 = 2.47
3 x = 2.47 + 2
3 x = 4.47
x = 1.49
5 x + 3 = 2 x + 9.7
5 x - 2 x = 9.7 - 3
3 x = 6.7
x = 6.7/3 = 67/30
( 2 x + 3 ) ( x - 5 ) = 0
x = - 3/2 ou 5
( 3 x - 4 ) ( 2 x + 7 ) = 0
x = 4/3 ou - 7/2
x² = 56.25
x = √56.25 ou - √56.25
x = 7.5 ou - 7.5
Explications étape par étape
