Question

26. Выполните действия: 1) (13+1,8), 4(5,4-2):73 2(6-4%):22; 5) (2} +0,26 ):0,1 3) (1.25 +) 24: 6(1,6-43):1, : 1,9.

Answer 1

1.

1) 1,8 = 1 8/10 = 1 4/5;

2) 1 3/5 + 1 4/5 = 2 7/5 = 3 2/5;

3) 3 2/5 * 1/2 = 17/5 * 1/2 = 17/10 = 1 7/10.

ответ: 1 7/10.

2.

1) 6 - 4 8/15 = 5 15/15 - 4 8/15 = 1 7/15;

2) 2,2 = 2 2/10 = 2 1/5;

3) 1 7/15 : 2 1/5 = 22/15 : 11/5 = 22/15 * 5/11 = 2/3 * 1/1 = 2/3.

ответ: 2/3.

3.

1) 1,25 = 1 25/100 = 1 1/4;

2) 1 1/4 + 1/6 = 1 3/12 + 2/12 = 1 5/12;

3) 2,4 = 2 4/10 = 2 2/5;

4) 1 5/12 * 2 2/5 = 17/12 * 12/5 = 17/1 * 1/5 = 17/5 = 3 2/5.

ответ: 3 2/5.

4.

1) 5,4 = 5 4/10 = 5 2/5;

2) 5 2/5 - 2 1/3 = 5 6/15 - 2 5/15 = 3 1/15;

3) 3 1/15 : 7 2/3 = 46/15 : 23/3 = 46/15 * 3/23 = 2/5 * 1/1 = 2/5.

ответ: 2/5.

5.

1) 0,25 = 25/100 = 1/4;

2) 2 1/3 + 1/4 = 2 4/12 + 3/12 = 2 7/12;

3) 0,12 = 12/100 = 3/25;

4) 2 7/12 * 3/25 = 31/12 * 3/25 = 31/4 * 1/25 = 31/100.

ответ: 31/100.

6.

1) 4 3/4 = 4,75;

2) 7,6 - 4,75 = 2,85;

3) 2,85 * 1,9 = 5,415.

ответ: 5,415.