Question

Задание 2. Упрости выражение и найди его значение.14а + За9+2 а=20Задание 3.Репши уравнение.220-х + 460 = 6 300:7Задание 4.Запиши выражение и реши задачу.Вертолет пролетел за 2 часа 568км . За какое время он пролетел 1.420км?помогите пожалуйста​

Answer 1

Ответ:

2)17а

3)-220

4)5часов

Answer 2

Task 2: Simplify the expression and find its value

The given expression is: 14a + 9 + 2a = 20

To simplify the expression, we can combine the like terms on the left side of the equation.

Combining the terms with 'a', we get: 14a + 2a = 16a

Now, the simplified equation becomes: 16a + 9 = 20

To find the value of 'a', we need to isolate the variable on one side of the equation.

Subtracting 9 from both sides of the equation, we get: 16a = 11

Finally, dividing both sides of the equation by 16, we find the value of 'a':

a = 11/16

Therefore, the value of 'a' is 11/16.

Task 3: Solve the equation

The given equation is: 220 - x + 460 = 6,300 ÷ 7

To solve this equation, we need to simplify both sides and isolate the variable 'x'.

Simplifying the right side of the equation, we have: 6,300 ÷ 7 = 900

Now, the equation becomes: 220 - x + 460 = 900

To isolate 'x', we need to combine the like terms on the left side of the equation.

Combining the terms, we get: 220 + 460 - x = 900

Simplifying further, we have: 680 - x = 900

To isolate 'x', we need to move 680 to the other side of the equation.

Subtracting 680 from both sides, we get: -x = 900 - 680

Simplifying, we have: -x = 220

To solve for 'x', we need to multiply both sides by -1 to eliminate the negative sign.

Multiplying both sides by -1, we get: x = -220

Therefore, the value of 'x' is -220.

Task 4: Write the expression and solve the problem

The problem states that a helicopter flew a distance of 568 km in 2 hours. We need to find the time it takes for the helicopter to fly a distance of 1,420 km.

Let's assume the time taken to fly 1,420 km is 't' hours.

We can set up the following proportion:

2 hours / 568 km = t hours / 1,420 km

To solve for 't', we can cross-multiply and then divide:

2 hours * 1,420 km = 568 km * t hours

2,840 km-hours = 568t

Dividing both sides by 568, we get:

t = 2,840 km-hours / 568 km

Simplifying, we find:

t = 5 hours

Therefore, it would take the helicopter 5 hours to fly a distance of 1,420 km.