Question

Задача№1 На одной копировальной машине можно распечатать 6 страниц в минуту,а на другой -8 стьраниц .Сколько страниц можно распечатать за 20 мин,если обе машины будут работать одновременно ? Решите задачу,состовив два разных выражения. Задача №2 В актовом зале стоят стулья ,по 17 стульев в ряду .Первые 12 рядов составленны из красных стульев ,а следующие 18 рядов-из синих стульев .Сколько стульев в актовом зале ? Решите задачу,составив два разных выражения. Задача №3 Успеет ли электровоз пройти 700км за 9ч,если первые 3ч он будет идти со скоростью 65км/ч ,а оставшиеся 3ч- со скоростью 78км/ч? Задание №4 Догадайтесь сами,как умножить письменно какое -нибудь число 101,и напешите свой способ.Придумайте несколько примеров умножения на 101 и решите их.

Answer 1

задача № 1: 1)6+8=14 стр. в минуту вместе печатают 2 машины. 2)14×280 стр. напечатают 2 машины за 20 мин.  или   1)6×20=120стр. напечатает 1 машина за 20 мин. 2)8×20=160стр. напечатает 2 машина за 20 мин. 3)120+160=280стр. напечатают вместе за 20 мин.задача № 2: 1)12×17=204 красных стула. 2)18×17=306 синих стульев. 3)204+306=510 стульев всего. или  1)12+18=30 рядов всего. 2)17×30=510 стульев всего.задача №3: 1)3×65=195км за первые 3 часа. 2)6×78=468км за оставшиеся часы. 3)195+468=663км за 9 часов. ВЫВОД: за 9 часов электровоз не успеет пройти 700км, так как 663<700 на 37 км. задача № 4: 46×101=46×1,46×0(0 не пишем),46×1=4646.  100×101=101 и в конце приписываем 2 нуля от 100=10100.

 

Answer 2

Problem 1: Printing Pages

To solve this problem, we need to calculate the total number of pages that can be printed in 20 minutes when both copiers are working simultaneously.

Let's start by calculating the number of pages each copier can print in 1 minute:

- Copier 1 can print 6 pages per minute. - Copier 2 can print 8 pages per minute.

To find the total number of pages printed in 20 minutes, we can multiply the number of pages printed per minute by the number of minutes:

- Copier 1: 6 pages/minute * 20 minutes = 120 pages - Copier 2: 8 pages/minute * 20 minutes = 160 pages

To find the total number of pages printed when both copiers are working simultaneously, we can add the number of pages printed by each copier:

- Total pages printed = Copier 1 pages + Copier 2 pages = 120 pages + 160 pages = 280 pages.

Therefore, if both copiers are working simultaneously for 20 minutes, they can print a total of 280 pages.

Problem 2: Number of Chairs in the Auditorium

To solve this problem, we need to calculate the total number of chairs in the auditorium.

Given: - There are 17 chairs in each row. - The first 12 rows are made up of red chairs. - The next 18 rows are made up of blue chairs.

To find the total number of chairs in the auditorium, we can multiply the number of chairs per row by the number of rows for each color and then add them together:

- Number of red chairs = 17 chairs/row * 12 rows = 204 chairs - Number of blue chairs = 17 chairs/row * 18 rows = 306 chairs

To find the total number of chairs in the auditorium, we can add the number of red chairs and the number of blue chairs:

- Total number of chairs = Number of red chairs + Number of blue chairs = 204 chairs + 306 chairs = 510 chairs.

Therefore, the auditorium has a total of 510 chairs.

Problem 3: Distance Covered by the Electric Locomotive

To solve this problem, we need to determine if the electric locomotive can cover a distance of 700 km in 9 hours, given its varying speeds.

Given: - The electric locomotive travels at a speed of 65 km/h for the first 3 hours. - The electric locomotive travels at a speed of 78 km/h for the remaining 3 hours.

To find the total distance covered by the electric locomotive, we can calculate the distance traveled at each speed and then add them together:

- Distance traveled at 65 km/h = Speed * Time = 65 km/h * 3 hours = 195 km - Distance traveled at 78 km/h = Speed * Time = 78 km/h * 3 hours = 234 km

To find the total distance covered, we can add the distance traveled at each speed:

- Total distance covered = Distance at 65 km/h + Distance at 78 km/h = 195 km + 234 km = 429 km.

Since the total distance covered is 429 km, which is less than the required distance of 700 km, the electric locomotive will not be able to cover the distance of 700 km in 9 hours.

Problem 4: Multiplying by 101

To multiply a number by 101, we can use the following method:

1. Write the number to be multiplied. 2. Append two zeros to the right of the number. 3. Add the original number to the result obtained in step 2.

For example, let's multiply 123 by 101:

1. Write the number: 123 2. Append two zeros: 12300 3. Add the original number: 123 + 12300 = 12423

Therefore, 123 multiplied by 101 is equal to 12423.

Here are a few more examples:

- 456 multiplied by 101: 45600 + 456 = 46056 - 789 multiplied by 101: 78900 + 789 = 79689

You can use this method to multiply any number by 101.