1) 3х-1=2х-4
х=-3
2) 3х+15=7-5х
8х=-8 :8
х=-1
3) 16у=192 :16
у=12
4) х=-24+36
х= 12
12 мин = 12/60 = 0,2
5 мин = 1/12
1 ч 30 мин = 90/60 или 1 целая 1/2 = 1,5
<span>1) 2 4/11-1= 26/11- 11/11= 15/11=1 4/11 ;
2) 2 4/11-1 7/11= 26/11-18/11= 8/11 </span>