Question

Я ВАС УМОЛЯЮ; Выполните действия 1) (-120):((-8)•(-3)+12:(-3))-(-48):(-16); 2) (-75)•4-204:(-3)+(-210):(-7); 3) (-20,25):(-3,6)+90,72:(-4,5)-7,5•3,2; Решите задачу! Цену ткани повысили сначала на 20%,а затем новую цену повысили еще на 25%. На сколько процентов была повышена в результате первоначальная цена товара? Пожалуйста нужно срочно!

Answer 1

- 120 : (- 8 * (- 3) + 12 : (- 3)) -  (- 48) : (- 16) = - 9
1) - 8 * (-3) = 24
2) 12 : (-3) = - 4
3) 24 + (- 4) = 20
4) - 120 : 20 = - 6
5) - 48 : (- 16) = 3
5) - 6 - 3 = - 9

- 75 * 4 - 204 : (- 3) + (- 210) : (- 7) = - 202
1) - 75 * 4 = - 300
2) 204 : (- 3) = - 68
3) - 210 : (- 7) = 30
4) - 300 - (- 68) = - 300 + 68 = - 232
5) - 232 + 30 = - 202

- 20,25 : (- 3,6) + 90,72 : (- 4,5) - 7,5 * 3,2 = - 38,535
1) - 20,25 : (- 3,6) = 5,625
2) 90,72 : (- 4,5) = - 20,16
3) 7,5 * 3,2 = 24
4) 5,625 + (- 20,16) = 5,625 - 20,16 = - 14,535
5) - 14,535 - 24 = - 38,535

Задача. Пусть х - цена ткани до подорожания. Процент - это сотая часть числа: 20% = 0,2; 25% = 0,25.
1) х * 0,2 + х = 1,2х - цена ткани после повышения цены на 20%;
2) 1,2х * 0,25 + 1,2х = 1,5х - цена ткани после повышения новой цены на 25%
3) Пропорция: 1 - 100%    (первоначальная цена)
                      1,5 - х        (окончательная цена)
х = 1,5 * 100 : 1 = 150% 
150% - 100% = 50% - на столько процентов была повышена первоначальная цена.

Answer 2

Task 1: (-120):((-8)•(-3)+12:(-3))-(-48):(-16)

To solve this expression, we need to follow the order of operations, which is parentheses, multiplication and division (from left to right), and finally addition and subtraction (from left to right).

Let's break down the expression step by step:

1. Evaluate the expression inside the parentheses: - (-8) • (-3) = 24 - 12 : (-3) = -4

2. Substitute the values back into the expression: - (-120) : (24 + (-4)) - (-48) : (-16)

3. Evaluate the multiplication and division from left to right: - (-120) : 20 - (-48) : (-16) - -6 - 3 - -9

Therefore, the value of the expression is -9.

Task 2: (-75)•4-204:(-3)+(-210):(-7)

Let's solve this expression step by step:

1. Evaluate the expression inside the parentheses: - (-204) : (-3) = 68 - (-210) : (-7) = 30

2. Substitute the values back into the expression: - (-75) • 4 - 68 + 30

3. Evaluate the multiplication and addition/subtraction from left to right: - -300 - 68 + 30 - -338 + 30 - -308

Therefore, the value of the expression is -308.

Task 3: (-20,25):(-3,6)+90,72:(-4,5)-7,5•3,2

Let's solve this expression step by step:

1. Evaluate the expression inside the parentheses: - (-20.25) : (-3.6) = 5.625 - 90.72 : (-4.5) = -20.16

2. Substitute the values back into the expression: - 5.625 + (-20.16) - 7.5 • 3.2

3. Evaluate the multiplication and addition/subtraction from left to right: - 5.625 + (-20.16) - 24

4. Perform the addition and subtraction: - -14.535

Therefore, the value of the expression is -14.535.

Task: Percentage Increase

To find the percentage increase, we need to compare the initial price with the final price.

Let's assume the initial price is 100 units.

1. Increase the initial price by 20%: - 100 + (20% of 100) = 100 + 20 = 120 units

2. Increase the new price by 25%: - 120 + (25% of 120) = 120 + 30 = 150 units

The final price is 150 units, which represents a 50% increase from the initial price of 100 units.

Therefore, the initial price was increased by 50% in the end.

I hope this helps! Let me know if you have any further questions.