Réponses

2014-01-09T17:41:29+01:00
X/5 - 1/3 = x
x - 1/3 = 5x
x = 5x + 1/3
x - 5x = 1/3
x + x = 1/3 : 5/1
2x = 1/3 * 1/5
2x = 1/15
x = 1/15 : 2
x = 15 * 2
x = 30

1/x-3 + 1/x = 3/x(x-3)
1/x + 1/x = -9
2/(x+x) = -9
2/2x = -9
2x = -18
x = -18:2
x = -9


x² - 4x/1-x=4
x² - x = 4x + 4
x - 4x =  4
x +x = 4 : 4
2x = 1
x = 0,5