13 г
14 б
15 а
............................................
1. BO-BD-CO-OA-AC-AD-OD 2. MK-KN-NP-EN-ES-NS-EK-KF-MP
-2x-4=3x
-2х-3=4
-5х=4
х=-4/5
х=-0,8
129-123=6 куб. в.
22руб. 20 коп. = 22,2
22,2*6= 133,2руб
6,2t-20,15+19,03-7,5t=6,2t-7,5t-20,15+19,03=-1,3t-1,12