Question

1) Авто проежает некоторое растояние за 1,8 ч за какое время он проедет с тойже скоростью расстояние в 4,5 раза больше 2) за некоторую сумму денег можно купить 12 тнких тетрадей сколько можно купить за эту же сумму денег толстых тетрадей которые в 3 раза дороже тонких 3) вычеслите длину окружности радиуса которой равен 6,5 дм ЗАРАНЕЕ СПС

Answer 1

1)
1,8*4,5=8,1 (ч)
Ответ: за 8,1 час

2)
12:3=4 (тетр)
Ответ: можно купить 4 толстых

3)
l=2пR, где l - длина окружности, п=3,14, R - радиус
l=2*3,14*6,5=40,82 (дм)
Ответ: длина окружности равна 40,82 дм

Answer 2

1) Авто проезжает некоторое расстояние за 1,8 ч. За какое время он проедет с той же скоростью расстояние в 4,5 раза больше?

To find the time it takes for the car to travel a distance that is 4.5 times larger, we can use the concept of proportionality. Since the car is traveling at a constant speed, the ratio of the distances traveled to the times taken will remain the same.

Let's assume that the initial distance traveled is D and the time taken is T. According to the given information, the car takes 1.8 hours to travel distance D.

Using the concept of proportionality, we can set up the following equation:

D / T = (4.5 * D) / X

Where X is the time taken to travel the distance that is 4.5 times larger.

To solve for X, we can cross-multiply and solve for X:

D * X = (4.5 * D) * T

X = (4.5 * D * T) / D

Simplifying the equation, we find:

X = 4.5 * T

Therefore, the car will take 4.5 times the initial time (1.8 hours) to travel a distance that is 4.5 times larger.

The car will take 8.1 hours to travel a distance that is 4.5 times larger..

2) За некоторую сумму денег можно купить 12 тонких тетрадей. Сколько можно купить за эту же сумму денег толстых тетрадей, которые в 3 раза дороже тонких?

Let's assume that the cost of one thin notebook is T. According to the given information, we can buy 12 thin notebooks for a certain amount of money.

Now, we are asked to find how many thick notebooks we can buy for the same amount of money, given that thick notebooks are 3 times more expensive than thin notebooks.

Let's assume the cost of one thick notebook is 3T.

To find the number of thick notebooks we can buy, we can set up the following equation:

12 * T = N * 3T

Where N is the number of thick notebooks we can buy.

Simplifying the equation, we find:

12 = 3N

Dividing both sides by 3, we find:

N = 4

Therefore, we can buy 4 thick notebooks for the same amount of money that can buy 12 thin notebooks.

3) Вычислите длину окружности, радиуса которой равен 6,5 дм.

The formula to calculate the circumference of a circle is given by:

C = 2 * π * r

Where C is the circumference, π is a mathematical constant approximately equal to 3.14159, and r is the radius of the circle.

Given that the radius of the circle is 6.5 dm, we can substitute this value into the formula:

C = 2 * π * 6.5

Calculating the value, we find:

C ≈ 2 * 3.14159 * 6.5

C ≈ 40.8407 dm

Therefore, the length of the circumference of a circle with a radius of 6.5 dm is approximately 40.8407 dm