Вычислите: 1) 7 14/15+2 1/15; 2) 9 24/27+12 13/27; 3) 1-12/19; 4) 8-3 6/15; 5) 12-11 6/11; 6) 16 3/13-6 8/13; 7) 13 4/9-2 8/9; 8) 10 7/16-4 12/16; 9) 29 49/53-8 49/53; 10) (20 16/25+13 9/25) - (23 4/14+7 13/14).

Question

Гость

Математика

25 июня, 05:37

Вычислите: 1) 7 14/15+2 1/15; 2) 9 24/27+12 13/27; 3) 1-12/19; 4) 8-3 6/15; 5) 12-11 6/11; 6) 16 3/13-6 8/13; 7) 13 4/9-2 8/9; 8) 10 7/16-4 12/16; 9) 29 49/53-8 49/53; 10) (20 16/25+13 9/25) - (23 4/14+7 13/14).

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Андрей Лазарев · Answer 1

Вычислим:

1) 7 14/15 + 2 1/15 = 9 + 15/15 = 10;

2) 9 24/27 + 12 13/27 = 21 + (24 + 13) / 27 = 21 + 37/27 = 21 + 1 10/27 = 22 10/27;

3) 1 - 12/19 = 19/19 - 12/19 = (19 - 12) / 19 = 7/19;

4) 8 - 3 6/15 = 7 15/15 - 3 6/15 = 4 9/15;

5) 12 - 11 6/11 = 11 11/11 - 11 6/11 = 5/11;

6) 16 3/13 - 6 8/13 = 15 16/13 - 6 8/13 = 9 8/13;

7) 13 4/9 - 2 8/9 = 12 13/9 - 2 8/9 = 10 5/9;

8) 10 7/16 - 4 12/16 = 9 23/16 - 4 12/16 = 5 11/16;

9) 29 49/53 - 8 49/53 = 21;

10) (20 16/25 + 13 9/25) - (23 4/14 + 7 13/14) = 71 3/14.

1. 20 16/25 + 13 9/25 = 33 25/25 = 34.

2. 23 4/14 + 7 13/14 = 36 17/14 = 37 3/14.

3. 34 + 37 3/14 = 71 3/14.