Réponses

2013-04-14T20:56:32+02:00

d)

\frac{4}{7}x +5 = 3x-3

\frac{4}{7}x = 3x-3-5

\frac{4}{7}x +3x= -8

\frac{4+21}{7}x= -8

\frac{25}{7}x= -8

25x= -8\times7

x= -\frac{56}{25}

 

 

e) 6 - 1sur3x = 5 + 3sur4x

6-\frac{1}{3}x = 5+\frac{3}{4}x

\frac{3}{4}x+\frac{1}{3}x = 6-5

\frac{9+4}{12}x = 1

\frac{13}{12}x = 1

x = \frac{12}{13}

 

En espérant t'avoir aidé.