1) 105+85+80=270 рублей всего
2)270/3=90 рублей стоил один билет
7/18*9/14=4
1/3*6/7=2/7
2/7+4=30/7
1) 2 3/10 - 1 7/15 = 2 9/30 - 1 14/30 = 1 39/30 - 1 14/30 = 25/30 = 5/6
2) 6 5/12 - 3 1/4 = 6 5/12 - 3 3/12 = 3 2/12 = 3 1/6
3) 10 - 3 3/9 = 10 - 3 1/3 = 9 3/3 - 3 1/3 = 6 2/3
4) 6 11/15 - 8 3/5 = 6 11/15 - 8 9/15 = 6 11/15 - 7 24/15 = - 1 13/15
1.7(5x-0.16)=0.238
5х-0.16=0.238:1.7
5х-0,16=0,14
5х=0,14+0,16
5х=0,30
х=0,30:5
х=0,06
Ответ: х=0,06
(1/3х)х + (1/х)3х = 0
1х/3х^2 + 3/3х^2 = 0
1х + 3 = 0
1х = -3
х = -3 : 1
х = -3