0,5х + 80 = 0,75х
0,5х - 0,75х = -80
- 0,25х = -80
х = -80 : (-0,25)
х = 320
0,5 * 320 + 80 = 0,75 * 320
160 + 80 = 240 всего денег
Ф-ла
t=s/v1-v2
t=150/275-100=26250мин
902 - a * 3 = 845
a * 3 = 902 - 845
a * 3 = 57
a = 57 : 3
a = 19
----------------------------
902 - 19 * 3 = 845
902 - 57 = 845
845 = 845
<span>(1* 2 +3)* 4* 5=100 .........</span>