Bonsoir
Résoudre les équations :
x/3 = x/4 - 6/5
(x * 4 * 5)/(3 * 4 * 5) = (x * 3 * 5)/(3 * 4 * 5) - (6 * 3 * 4)/(3 * 4 * 5)
20x/60 = 15x/60 - 72/60
20x = 15x - 72
20x - 15x = -72
5x = -72
[tex]\bf{x = -72/5}[/tex]
5x/8 - 3/10 = 7x/40
(5x * 5)/(8 * 5) - (3 * 4)/(10 * 4) = 7x/40
25x/40 - 12/40 = 7x/40
25x - 12 = 7x
25x - 7x = 12
18x = 12
x = 12/18
x = (2 * 6)(/(3 * 6)
[tex]\bf{x = 2/3}[/tex]
2x/7 + 3/14 = x/7 - 1/14
2x/7 - x/7 = -3/14 - 1/14
x/7 = -4/14
x = -4 * 7/14
x = -2 * 14/14
[tex]\bf{x = -2}[/tex]
2x/5 - 1/9 = 3x/9 + 4/5
(2x * 9)/(5 * 9) - (1 * 5)/(9 * 5) = (3x * 5)/(9 * 5) + (4 * 9)/(5 * 9)
18x/45 - 5/45 = 15x/45 + 36/45
18x - 5 = 15x + 36
18x - 15x = 36 + 5
3x = 41
[tex]\bf{x = 41/3}[/tex]
