Пошаговое объяснение:
85
1)
1/3х + 1/4х + 1/8х = 34/45
8/24х + 6/24х + 3/24х = 34/45
17/24х = 34/45
х = 34/45 : 17/24
х = 34/45 * 24/17
х = 2/15 * 8/1
х = 16/15
х = 1. 1/15
2)
3. 3/4х - 1. 2/3 = 2. 11/12
3. 3/4х = 2. 11/12 + 1. 2/3
3. 3/4х = 2. 11/12 + 1. 8/12
3. 3/4х = 3. 19/12
3. 3/4х = 4. 7/12
15/4х = 55/12
х = 55/12 : 15/4
х = 55/12 * 4/15
х = 11/3 * 1/3
х = 11/9
х = 1. 2/9
86
1) 3. 1/4 + 3. 5/6 = 3. 3/12 + 3. 10/12 = 6. 13/12 = 7. 1/12
2) 5. 3/4 - 3. 2/3 = 5. 9/12 - 3. 8/12 = 2. 1/12
3) 7. 1/12 : 2. 1/12 = 85/12 : 25/12 = 85/12 * 12/25 = 85/25 = 17/5
4) 40% = 40/100 = 2/5
2/5 * 17/5 = 34/25 = 1. 9/25
ответ: 1. 9/25
