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(6-2 4/5)*3 1/8 - 1 3/5:1/4=?
4 1/6*(1 1/2 - 3/5)+(3/4+5/6)*6=?
7*2 6/7+ 53/12:(7/9-9/4)=?
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Ответы
Ответ:
Пошаговое объяснение:
№3
(6-2 4/5)*3 1/8 - 1 3/5:1/4= 3,6
1) 6-2 4/5 = 5 5/5 - 2 4/5 = 3 1/5
2) 3 1/5 * 3 1/8 = 16/5 * 25/8 = 10
3) 1 3/5 : 1/4 = 8/5 * 4 = 32/5 = 6 2/5 = 6,4
4) 10 - 6,4 = 3,6
№4
4 1/6*(1 1/2 - 3/5)+(3/4+5/6)*6= 13 1/4
1) 1 1/2 - 3/5 = 1 5/10 - 6/10 = 15/10 - 6/10 = 9/10
2) 4 1/6 * 9/10 = 25/6 * 9/10 = 15/4 = 3 3/4 = 3,75
3) 3/4+5/6 = 9/12 + 10/12 = 19/12
4) 19/12 * 6 = 19/2 = 9,5
5) 3 3/4 + 19/2 = 3 3/4 + 38/4 = 3 3/4 + 9 2/4 = 13 1/4
№5
7*2 6/7+ 53/12:(7/9-9/4)= 17
1) 7 * 2 6/7 = 7 * 20/7 = 20
2) 7/9-9/4 = 28/36 - 81/36 = - 53/36
3) 53/12 : (-53/36) = 53/12 : (- 36/53) = -3
4) 20 + (-3) = 17
Пошаговое объяснение:
№1
1) 6 - 2. 4/5 = 5. 5/5 - 2. 4/5 = 3. 1/5
2) 3. 1/5 * 3. 1/8 = 16/5 * 25/8 = 2/1 * 5/1 = 10/1 = 10
3) 1. 3/5 : 1/4 = 8/5 * 4/1 = 32/5 = 6. 2/5
4) 10 - 6. 2/5 = 9. 5/5 - 6. 2/5 = 3. 3/5
№2
1. 1/2 - 3/5 = 1. 5/10 - 6/10 = 15/15 - 6/10 = 9/10
2) 4. 1/6 * 9/10 = 25/6 * 9/10 = 5/2 * 3/2 = 15/4 = 3. 3/4
3) 3/4 + 5/6 = 9/12 + 10/12 = 19/12
4) 19/12 * 6 = 19/2 * 1 = 19/2 = 9 1/2
5) 3. 3/4 + 9. 1/2 = 3. 3/4 + 9. 2/4 = 12. 5/4 = 13. 1/4
№3
1) 7/9 - 9/4 = 28/36 - 81/36 = -53/36
2) 53/12 : (-53/36) = 53/12 * (-36/53) = -36/12 = -3
3) 7 * 2. 6/7 = 7 * 20/7 = 1 * 20/1 = 20/1 = 20
4) 20 + (-3) = 20 - 3 = 17