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1、 (1) Xiaoxing and Xiaoli read extra-curricular books. Xiaoxing read 40 pages, which is 4 / 5 of the pages Xiaoli read. How many pages did Xiaoli read? (2) Xiaoxing and Xiaoli read extra-curricular books, and Xiaoxing read 40 pages, which is 1 / 4 more than Xiaoli's. how many pages did Xiaoli read? (3) Xiaoxing and Xiaoli read extra-curricular books, and Xiaoxing read 40 pages, How many pages did Xiao Li read? (4) Xiao Xing and Xiao Li read extra-curricular books, Xiao Xing read 40 pages, and Xiao Li read 1 / 5 more pages than Xiao Xing. How many pages did Xiao Li read? 2、 An engineering team dug a canal. On the first day, it dug 3 / 10 of the total length, and on the second day, it dug 1 / 5 of the total length. In two days, it dug a total of 120m. How many meters is the total length of the canal? (solution of equations) 3、 Hongqi machinery factory plans to process a batch of parts. After processing 1 / 4 of them, it will have to process another 300 parts to complete the production task. How many parts are there in total Find the relation of these How much does a occupy B? If you ask for a, you will multiply and if you ask for B, you will divide If a is more than B, then B will multiply (1 + more) and B will multiply (1 - more) We need this kind of relationship
One (1) 40 / (4 / 5) = 50 (2) 40 * (1-1 / 4) = 30 (3) 40 * (1 + 1 / 5) = 48 (4) 40 * (1 + 1 / 5) = 48 two, 120 / (3 / 10 + 1 / 5) = 240 three, let the total length be x meters, so the following equation (1-1 / 4) x = 300 x = 240 four, let a bookcase have X books
Sixth grade math problem proportion (use the solution proportion to do and write the equivalent relation)
The bottom area of a cylindrical iron block is 28.26 square centimeters and its height is 24 centimeters. If it is poured into a cylinder with a radius of 6 centimeters, what is its height?
Hello, jinglik
Inverse proportion problem
Cylinder bottom area × cylinder height = iron block bottom area × iron block height
Set the height to x centimeters
3.14×6×6×X＝28.26×24
113.04X＝678.24
X＝678.24÷113.04
X＝6
What is the basic relationship between chicken and rabbit in the same cage in the mathematics book of grade six of primary school
You'd better make assumptions,
Solution 1: the number of chickens = (the number of rabbit's feet × the total number of rabbits - the total number of feet) / (the number of rabbit's feet - the number of chicken's feet)
Number of rabbits = total number of chickens
Solution 2: the number of rabbits = the total number of feet - the number of feet of chickens × the total number of rabbits) / (the number of feet of rabbits - the number of feet of chickens)
Number of chickens = total number of rabbits
Solution 3: the number of rabbits = the total number of feet △ 2 - the total number of heads
Number of chickens = total number of rabbits
The key is to understand. It's more difficult to memorize concepts
Mathematical quantity relation of primary school
Help me to write down all I know~~
Principal * interest rate = interest
Unit price * quantity = total price
Work efficiency * time = total work
Single output * quantity = total output
Each copy * copies = total speed = time * distance
Principal * interest rate * time = interest
The main quantitative relationship in tree planting is: the number of intervals × the number of meters in each interval = the total number of meters;
The main quantitative relationship of the problem of sawing wood is: the times of sawing times of sawing = the total time needed;
The quantity relation in the problem of climbing stairs is: the number of stairs △ the number of stairs between every two floors = the number of stairs
The main relation of the bell ringing problem is: the number of times to wait × the time to wait for one time = the total time
Survival rate = survival trees / total trees
Pass rate = pass / total
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- 12. There were originally a passengers on the bus, B passengers on the way down and 3 passengers on the way up. Now there are () passengers on the bus
- 13. Write the quantitative relation according to the meaning of the question (1) There were 46 passengers on the train. After arriving at station a, some of them got off. There were 8 passengers coming up. Now there are 50 passengers on the train. How many passengers are going down from station a? (2) The fruit shop shipped 25 cases of apples and 32 cases of pears, weighing 1870 kg. It is known that each case of apples weighs 30 kg. How many kg does each case of pears weigh? (3) The bottom of the triangle is 3 meters and the area is 12 square meters. How high is it? Can you describe it in words? A ship with diesel can use up to 6 hours, when the wind, 30 kilometers per hour. When driving back against the wind, the distance per hour is 80% of the downwind. How far should the ship go before it goes back?
- 14. Write the quantity relation according to the condition The water pipe has been repaired 3 / 5 a day 2. A pile of coal uses the remaining 2 / 3 In the question: 11 / 15 times 3 and 3 times 11 / 15 have different meanings, but the results are the same?
- 15. Use equation or arithmetic to solve the following practical problems, and write the equivalent relation 1. The store shipped 4 tons of apples, 3 / 4 less than 2 times of oranges. How many tons of oranges? 2. An engineering team built a highway. It was 38 meters in the first day, and 40 meters in the second day. The second day more than the first day, it was 1 / 28 of the total length of the road. How many meters is the total length of the road?
- 16. Xiaohong and Xiaoqiang start from home at the same time. Xiaohong walks 52 meters per minute and Xiaoqiang 70 meters per minute. They meet at a on the way. If Xiaohong starts 4 minutes ahead of schedule and Xiaoqiang walks 90 meters per minute, they still meet at a. how many meters are Xiaohong and Xiaoqiang's homes apart?
- 17. The distance between a and B is 672km. A passenger car and a freight car leave from the two places and meet each other at 3.2km. The passenger car travels 120km per hour, and the freight car travels how many kilometers per hour? [equation solution] There are 162 people in factory a and factory B. the number of people in factory a is equal to 1 / 5 of that in factory B. how many people are there in each factory
- 18. The carrying capacity of "Shenqi" is five seventh more than that of "Shenzhou 6". First write the quantity of unit 1, and then write the quantity relation
- 19. Math problem (to be solved in elementary school) (it's better not to use equation, but it doesn't matter) In a certain math exam, 52 students in the class took part in five questions, and they just did 181 right questions. It is known that each student does at least one right question, seven people do one right question, six people do all five right questions, and the number of people do two and three right questions is the same, so how many people do four right questions? If a and B are two natural numbers, and a / 5 + B / 11 = 37 / 55, what is the value of a + B?
- 20. For slightly complex equations, use equations and list the relations as follows: (1) 50x-3 × 0.8 = 62.6 (2) 24x + 9 ÷ 0.03 = 301.6 (3) my mother bought two teapots and eight water cups, which cost 122 yuan, including 35 yuan for each teapot. Q: how much is each water cup? (4) the canteen brought six baskets of Chinese cabbage and spinach. It is known that the total amount of Chinese cabbage is 48 kg more than spinach, and each basket weighs 36 kg? Wisdom questions 1. June day is approaching. A children's clothing store sells 357 skirts a week, of which 43 skirts are sold every day in the first three days. How many skirts are sold every day in the last four days? 2. If a rectangular classroom is paved with 8dm long floor tiles, it just needs 125. If it is paved with 1m long floor tiles, how many fewer such tiles are needed?