Найдите выражение: 1. (-2 3/14) + (-1 5/7) - (-19/21) 2. (2 3/14-1 5/7+19/21) 3. - (-4) : (-1 1/3) 4. (-3 1/9) + (1 5/12) - (-17/18) 5. (3 1/9-1 5/12+17/18) 6. - (-7) : (-1 1/6).

Question

Фёдор Фомин

Математика

6 апреля, 08:00

Найдите выражение: 1. (-2 3/14) + (-1 5/7) - (-19/21) 2. (2 3/14-1 5/7+19/21) 3. - (-4) : (-1 1/3) 4. (-3 1/9) + (1 5/12) - (-17/18) 5. (3 1/9-1 5/12+17/18) 6. - (-7) : (-1 1/6).

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Ирина Смирнова · Answer 1

1. - 2 3/14 + (-1 5/7) - (-19/21) = - 2 3/14 - 1 5/7 + 19/21 = - 2 9/42 - 1 30/42 + 38/42 =

= - 3 39/42 + 38/42 = - 3 1/42;

2. (2 3/14 - 1 5/7 + 19/21) = 2 9/42 - 1 30/42 + 38/42 = 1 51/42 - 1 30/42 + 38/42 =

= 21/42 + 38/42 = 59/42 = 1 17/42;

3. - (-4) / (-1 1/3) = 4 * (-3/4) = - 12/4 = - 3;

4. - 3 1/9 + 1 5/12 - (-17/18) = - 3 1/9 + 1 5/12 + 17/18 = - 3 4/36 + 1 15/36 + 34/36 =

= - 2 40/36 + 1 15/36 + 34/36 = - 1 25/36 + 34/36 = - 61/36 + 34/36 = - 27/36 = - 3/4;

5. 3 1/9 - 1 5/12 + 17/18 = 3 4/36 - 1 15/36 + 34/36 = 2 40/36 - 1 15/36 + 34/36 =

= 1 25/36 + 34/36 = 1 59/36 = 2 23/36;

6. - (-7) / (-1 1/6) = 7 / (-7/6) = 7 * (-6/7) = - 6;