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Fill in the blanks of mathematical quantity relation According to "10% off a piece of clothing", we can write the quantity relation ()
Y = 0.9x (x > 0)~
Y refers to the current price
X refers to the original price
To write a quantity relation
There are two sections of rope. The first section is 90 meters long, and the second section is 50 meters long. After the same length of the two sections of rope is cut off, the first section is twice as long as the second section. How many meters of the two sections of rope are cut off?
Be sure to write the quantity relation, fast
Let X be cut, 90-x = 2 (50-x), and x = 10, so cut 10 meters from each of the two sections
What are the common mathematical quantitative relations?
Working hours * working efficiency = total amount of work
Total workload △ work efficiency = working hours
Total amount of work △ working time = work efficiency
Speed × time = distance
Distance △ speed = time
Distance △ time = speed
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
Mathematics problems of grade 6 in primary school (solving equations and multiplying fractions)
1. The underground part of Nanjing Metro Line 1 is about 14.3 km long, which is 0.7 km less than that of the above ground part. How long is the above ground part? (solution of equations)
2. It costs 135 yuan for mom to buy a suit of clothes. The price of the coat is twice that of the trousers. How much are the coat and the trousers
3. The speed of the cheetah in pursuit of its prey is about three times that of an excellent sprinter in the 100 meter race, which is about 20 meters more than that of the sprinter per second. How many meters does the sprinter run per second? What about the cheetah
4. Xiaofang has 36 stamps. Xiaohua has one third more stamps than Xiaofang. How many stamps does Xiaohua have? How many stamps does Xiaohua have? (fractional multiplication)
The teacher will check tomorrow, at 9:30 at the latest
I don't know what to ask
1. Suppose the length of the ground part is x km. 2x-0.7 = 14.3, x = 7.5 a, and the length of the ground part is 7.5 km. 2. Suppose the pants is x yuan, then the coat is 2x yuan. X + 2x = 135, 3x = 135, x = 452X = 2 * 45 = 90 A: the pants is 45 yuan, and the coat is 90 yuan
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- 11. 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
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- 13. 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
- 14. 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?
- 15. 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?
- 16. 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?
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