(-3 1/4 + 1 7/8) - 363,6 : (-120) - 3 11/200 = - 1,4
1. -3 1/4 + 1 7/8 = 15/8 - 26/8 = -11/8 = -1 3/8 = - 1,375
2. 363,6 : 120 = 3,03 = 3 6/200
3. 3 6/200 - 3 11/200 = - 5/200 = - 0,025
4. - 1,375 - 0,025 = - 1,4
5/12 х - 3/10 у - 7/18 х - 5/18 у = 15/36 x - 14/36 x - 27/90 y - 25/90 y =
= 1/36 x - 26/45 y