Ответ:

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 * 24/17

х= 1 1/15

2) 3 3/4х -1 2/3=2 11/12

14/4х - 5/3 = 35/12

14/4х= 35/12 + 5/3

14/4х= 35/12 + 20/12

14/4х= 55/12

х= 55/12 * 4/14

х= 1 13/42

№86

(3 1/4 + 3 5/6) : ( 5 3/4 - 3 2/3)= 3 2/5

1) 3 1/4 + 3 5/6= 13/4 +23/6= 39/12 +46/12= 85/12

2) 5 3/4 - 3 2/3= 23/4 - 11/3= 69/12 -44/12= 25/12

3) 85/12 : 25/12= 85/12 * 12/25=17/5 = 3 2/5

40% - х

100% - 3 2/5

х= 3 2/5 * 40% : 100%

х= 1,36  це 40% від виразу

Ответ:

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