Question

Решите уровнения: 1. (1,15+х)*3,8=9,5 2 .9:(7,8-х)=3,6 3. 27,6 + 14,6х=64,1 4. 36,5:х-8,1=6,5 5. 7,2у + 4,5у=21,06 6. 3,4х-3,2х=15,2 и задачу: Купили 1,8 кг рыбы и 1,5 кг мяса. За всю покупку заплатили 93,96 грн. Сколько стоит 1 кг рыбы, если 1 кг мяса стоит 37,2 грн.? спасибо

Answer 1

1) (1,15+х)*3,8=9,5
4.37+3.8х=9.5
3.8х=5.13
х=1.35

2) 9:(7,8-х)=3,6
9=(7.8-х)*3.6
9=28.08-3.6х
-3,6х=-19,08
х=5.3

3)27,6 + 14,6х=64,1
14.6х=36.5
х=2.5

4)36,5:х-8,1=6,5
36,5:х=14.6
36.5=14.6х
х=2.5

5) 7,2у + 4,5у=21,06
11.7у=21.06
у=1.8

6) 3,4х-3,2х=15,2
0.2х=15.2
х=76

Answer 2

1) (1,5+x)*3,8=9,5
5,7+3,8x=9,5
3,8x=9,5-5,7
3,8x=3,8
X=3,8/3,8
X=1

Answer 3

Equations:

To solve the given equations, let's go through each one step by step.

1. (1.15 + x) * 3.8 = 9.5 + 2 2. 0.9 / (7.8 - x) = 3.6 + 3 3. 27.6 + 14.6x = 64.1 + 4 4. 36.5 / x - 8.1 = 6.5 + 5 5. 7.2y + 4.5y = 21.06 + 6 6. 3.4x - 3.2x = 15.2

Let's solve each equation one by one.

1. (1.15 + x) * 3.8 = 9.5 + 2

Expanding the equation: 3.8 * 1.15 + 3.8 * x = 11.5

Simplifying: 4.37 + 3.8x = 11.5

Subtracting 4.37 from both sides: 3.8x = 11.5 - 4.37

Simplifying: 3.8x = 7.13

Dividing both sides by 3.8: x = 7.13 / 3.8

Calculating: x ≈ 1.876

2. 0.9 / (7.8 - x) = 3.6 + 3

Multiplying both sides by (7.8 - x): 0.9 = (3.6 + 3) * (7.8 - x)

Simplifying: 0.9 = 6.6 * (7.8 - x)

Dividing both sides by 6.6: 0.9 / 6.6 = 7.8 - x

Calculating: 0.13636363636363635 = 7.8 - x

Subtracting 7.8 from both sides: -7.663636363636364 = -x

Multiplying both sides by -1: 7.663636363636364 = x

x ≈ 7.664

3. 27.6 + 14.6x = 64.1 + 4

Subtracting 4 from both sides: 27.6 + 14.6x - 4 = 64.1

Simplifying: 23.6 + 14.6x = 64.1

Subtracting 23.6 from both sides: 14.6x = 64.1 - 23.6

Simplifying: 14.6x = 40.5

Dividing both sides by 14.6: x = 40.5 / 14.6

Calculating: x ≈ 2.77

4. 36.5 / x - 8.1 = 6.5 + 5

Adding 8.1 to both sides: 36.5 / x = 11.5

Multiplying both sides by x: 36.5 = 11.5x

Dividing both sides by 11.5: x = 36.5 / 11.5

Calculating: x ≈ 3.174

5. 7.2y + 4.5y = 21.06 + 6

Combining like terms: 11.7y = 27.06

Dividing both sides by 11.7: y = 27.06 / 11.7

Calculating: y ≈ 2.313

6. 3.4x - 3.2x = 15.2

Combining like terms: 0.2x = 15.2

Dividing both sides by 0.2: x = 15.2 / 0.2

Calculating: x = 76

Problem:

Now let's solve the given problem:

"Купили 1.8 кг рыбы и 1.5 кг мяса. За всю покупку заплатили 93.96 грн. Сколько стоит 1 кг рыбы, если 1 кг мяса стоит 37.2 грн.?"

Let's assume the cost of 1 kg of fish is x.

The total cost of fish is 1.8 * x, and the total cost of meat is 1.5 * 37.2.

According to the problem, the total cost of the purchase is 93.96.

So we can write the equation:

1.8x + 1.5 * 37.2 = 93.96

Simplifying: 1.8x + 55.8 = 93.96

Subtracting 55.8 from both sides: 1.8x = 93.96 - 55.8

Simplifying: 1.8x = 38.16

Dividing both sides by 1.8: x = 38.16 / 1.8

Calculating: x ≈ 21.2

Therefore, 1 kg of fish costs approximately 21.2 грн.

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