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Several primary school mathematics application problems, help to solve 1. The length of a wall clock's hand is 20 cm. How many cm does the tip of the hand walk in a day and night? 2. The diameter of a round flower bed is 3 meters. A circle of railings is set 0.8 meters away from the flower bed. How many meters is the total length of the railings? 3. The circumference of a piece of square paper is 20 decimeters. Cut it into the largest circle. How many decimeters is the circumference of this circle? 4. The express train from a to B runs in 8 hours, and the local train from B to a runs in 12 hours. The two trains run from a and B at the same time. On the way, the two trains meet and continue to move forward. After 6 hours, the distance between the two trains is 90 kilometers. How many meters is the distance between a and B? Want arithmetic solution, don't equation solution, also want to explain, trouble, online, etc., will add reward, hurry up
1. The length of a wall clock is 20 cm, how many cm does the tip of the clock go in a day and night? The length of a wall clock is 20 cm, that is, the radius of the dial is 20 cm. To find out how many cm the tip of the clock goes in a day and night is to find out the circumference of the dial. 2 * 20 * π = 40 π = 40 * 3.14 = 125.6
There is an inlet pipe in the pool, which can be filled in 5 hours. There is an outlet pipe at the bottom of the pool, which can be filled in 8 hours. If the inlet and outlet pipes are opened at the same time, how many hours can the empty pool be filled?
Formula, write it out
It's a primary school problem. It can only be solved with primary school knowledge
There is an inlet pipe in the pool, which can be filled in 5 hours. There is an outlet pipe at the bottom of the pool, which can be filled in 8 hours. If the inlet and outlet pipes are opened at the same time, how many hours can the empty pool be filled?
One divided by one eighth minus one fifth = thirteen and one third (hours)
A: then the empty pool can be filled in 13 and a third of an hour
Answer the question according to the dialogue
Lao Niu: "I'm so tired."
Pony: "you are still tired, you carry two more than me!"
Lao Niu: "take one from your back. The package I carry is twice as big as yours!"
The pony said
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