Réponses

2014-10-28T10:34:27+01:00
(4x+3)/(x+3)=3/x
[x(4x+3)/x(x+3)] = [3(x+3)/ x(x+3)]
(4x
² + 3x)/ (x² + 3x) = (3x +9)/ (x² + 3x)
4x² + 3x = 3x + 9
4x²=9
√4x² = √9
2x = 3
x=3/2
merci ! :)
Attention si 4x²=9 alors 2x=3 ou 2x=-3 ce qui donne 2 solutions x=3/2 ou x=-3/2