1) - 2/3 - 5/6 + 4/9 = - 12/18 - 15/18 + 8/18 = - 19/18
2) - 6/12 - 1/6 = - 6/12 - 2/12 = - 4/12 = - 1/3
aici cred ca x este inmultit, iar dupa - 1/6 este = nu +. Adevarat?
3) - 3/4 * (- 5/6) - 5/9 = 15/24 - 5/9 = 45/72 - 40/72 = 5/72
4) 5/8x - x = - 3/4
5x/8 - 8x/8 = - 6/8
- 3x/8 = - 6/8
x/8 = 6/8
x = 6
