Mathematical problems, application problems, formulation and calculation, to write the process clearly There is a clock. The minute hand is 8cm long. This minute hand has been walking for 45 minutes. How many cm does the needle tip travel?

The minute hand is 45 minutes
45 △ 60 = 3 / 4
What is the distance of the needle
8 × 2 × 3.14 × 3 / 4 = 37.68 cm

RELATED INFORMATIONS

1. (fill in the blanks) and practical questions 1. This year's wheat output is 10% higher than that of last year. This year's wheat output is equivalent to () percent of last year's 2. The original price of a product was 200 yuan per piece. After the price increased by 20%, it decreased by 20%. Now the price of each piece is () yuan 3. For a bucket of pesticide, 34 kg is taken out for the first time, 5% is taken out for the second time, and 30% is left. How many kg is this batch of pesticide,
2. Answer to 100 practical questions in Grade 6
3. The Sixth Grade 100 must have the answer computation question
4. Application of simple equation in grade five The simplest
5. How to correctly answer the score application questions
6. Ask three practical questions and answer them as soon as possible 1. There are five numbers, and their average number is 168. If the five numbers are arranged from large to small, the average of the first three numbers is 108, and the average of the last three numbers is 217. What is the number in the middle? 2. The number a is 240, 25% more than the number B. what is the sum of a and B? 3. There is a fraction, the numerator is 13 smaller than the denominator. If the numerator adds 18, the denominator adds 21, and the score value remains unchanged, what is the original fraction?
7. Three practical problems of mathematics fraction, 1. There are 780 kg of pears and apples in the food store. Three fifths of the apples are sold and 150 kg of pears are sold. At this time, the weight of apples and pears is the same. How many kg of apples are there? 2. From the fourth city to the second city, a car runs 2 / 5 of the whole road in the first hour, and 10 kilometers more in the second hour than in the first hour. At this time, the distance from the second city is exactly 1 / 10 of the whole road. How long is the whole road? 3. Xiao Ming read a story book. On the first day, he read 1 / 4 of the whole book. On the second day, he read 5 pages less than on the first day. There are 30 pages left. How many pages are there in this book?
8. Several calculation problems. Urgent solution. To process Power 2008 of (- 0.25) ×power2009 of (- 4) (2 and 3 / 5 + 1 and 3 / 20) △ 1 and 2 / 3 1 and 1 / 6 + 3 and 1 / 12 + 5 and 1 / 20 + 7 and 1 / 30 + 9 and 1 / 42
9. Mark application questions (clear process) 1. The ratio of salt to water in one bottle of brine is 1:4, and the concentration of the other bottle of brine is 10%. After mixing two bottles of brine, the concentration is 12%. What is the weight ratio of the two bottles of brine? 2. 200 grams of 10% salt water and 20 grams of 20% salt water are mixed, and the concentration becomes 12%. How many grams of salt water are mixed? 3. When a commodity is sold at its original price, it can make a profit of 25%. Later, when the cost rises, it will raise the price by 20%, and it can only make a profit of 20%. How much does the cost rise?
10. Score application questions (detailed process) A pile of 12 tons of sand is divided into three piles. The sum of the masses of the first pile and the second pile is seven and three tenths, and the sum of the masses of the first pile and the third pile is six and five eighths. Q: how many kilograms do the three piles of sand weigh?
11. The results of a class's Chinese test paper are all integers, with a minimum score of 82. It is known that at least four students in the class have the same score. How many students are there in this class?
12. Sixth grade second volume mathematics examination paper application question, seeks the process and the answer! Urgently needs! There are 45 balls in a bag, with an average of 5 colors. How many of the 6 balls are the same color?
13. The perimeter of a rectangle is 36 cm, and the ratio of length to width is 5:4. The area of the rectangle is______ ．
14. When a car drives from city a to city B, the ratio of the distance traveled to the distance not traveled is 1:3. If it travels another 130 kilometers, the ratio of the distance traveled to the distance not traveled is 5:2. A, how many kilometers are there between the two cities?
15. Help primary school mathematics to pursue practical problems
16. The second grade of junior high school In order to improve the situation, the municipal company decided to contract the drainage project of a section of the road to Party A and Party B. the cooperation between Party A and Party B will take 12 days to complete; if Party A completes the project alone, it will take 20 days, Each construction day of Party B needs 10000 yuan, and the cost of completing the project does not exceed 350000 yuan, so how many days does the construction team of Party B need at least? ------------------------------Suppose, formula and final answer------------------------------
17. A cone and a cylinder have the same volume and bottom area. The height of the cone is () times that of the cylinder It's due tomorrow
18. It is known that the volume of a cone is 6 | 1 of the volume of a cylinder, and the height of a cone is 4.8
19. A problem of calculating trapezoidal area in Volume 1 of grade 5 Form a flower bed by the wall. The fence is 46m long. Calculate the area of the flower bed The height is 20 meters
20. Ask for help everyone who has: Beijing Normal University Edition fifth grade first volume mathematics second unit graph area application question! Urgent need for answers, please hurry up!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! ！！！！！！！！！！！！！！！！！！！！！！！！！！！！！！！！！！！！！！！！！！！！！！