1133.
1) 2 2/3 : 2 + (4/15 + 2/5) : (3 1/3 * 3/5) = 1 2/3
1) 4/15 + 2/5 = 4/15 + 6/15 = 10/15 = 2/3
2) 3 1/3 * 3/5 = 10/3 * 3/5 = 2
3) 2 2/3 : 2 = 8/3 : 2/1 = 8/3 * 1/2 = 8/6 = 4/3
4) 2/3 : 2 = 2/3 * 1/2 = 1/3
5) 4/3 + 1/3 = 5/3 = 1 2/3
2) 2 : 1/4 + ((1 1/2 + 2 2/3) : 3 3/4 - 2/3) : 8 8/9 = 8,05
1) 1 1/2 + 2 2/3 = 1 3/6 + 2 4/6 = 3 7/6 = 4 1/6
2) 4 1/6 : 3 3/4 = 25/6 : 15/4 = 25/6 * 4/15 = 5/3 * 2/3 = 10/9 = 1 1/9
3) 1 1/9 - 2/3 = 1 1/9 - 6/9 = 10/9 - 6/9 = 4/9
4) 4/9 : 8 8/9 = 4/9 : 80/9 = 4/9 * 9/80 = 4/80 = 1/20
5) 2 : 1/4 = 2 * 4 = 8
6) 8 + 1/20 = 160/20 + 1/20 = 161/20 = 8 1/20 = 8,05
1134.
3) 16х² 5²у
------ × ------ = 10х
5у 2³х
1470:7=210м (каждый) 210:5=42 м (ежедневно каждая)
300-(x*4+98)=86
300-(4x+98)=86
300-4x-98=86
202-4x=86
-4x=86-202
-4x=-116
x=29
Ответ:x=29
2:40=0,05 км/мин=50 м/мин
или
2 км=2000 м
2000:40=50 м/мин=0,05 км/мин