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The problem of mathematical calculation is poor, but there is no problem in the calculation of practical problems. Why
In the application questions, the mathematical calculation formula can be obtained according to the situation and description logic, and the final result can be obtained according to the known results. The main test is the ability of text comprehension. The main test of mathematical calculation questions is the application of corresponding calculation methods and skills. When you see the question type, you should reflect the corresponding knowledge points, and use the calculation skills of knowledge points to solve them, Sum up the common points of each knowledge topic, to see the corresponding topic can know the test is that knowledge, the rest is the mechanical calculation
The perimeter of a rectangle is 130 cm. If its width increases by 15 and its length decreases by 18, a new rectangle with the same perimeter will be obtained. Find the area of the original rectangle
From the meaning of the title: the length of the original rectangle is 130 ／ 2 ／ (8 + 5) × 8 = 40 (CM), the width is 130 ／ 2-40 = 25 (CM), then 25 × 40 = 1000 (square cm); answer: the area of the original rectangle is 1000 square cm
Simplify the power of 8a-a to the third power + the power of a to the second power + the power of 4A to the third power - the power of a to the second power - 7a-6
The third power of 8a-a + the second power of a + the third power of 4a-a-the second power of a-7a-6
=(8-7)a+(-1+4)a³+(1-1)a²-6
=3a³+a-6
A 200m long train passes the 1800m long railway bridge at the speed of 20m / s. how long does it take for the train to pass the bridge?
According to the formula: v = st, t = SV = 2000m, 20m / S = 100s. A: it takes 100s for all trains to pass the bridge
It is known that the circumference of a rectangle is 12cm. Let one side of the rectangle be xcm, then its area is YCM?. the analytic expression of the function of X is (), and the value range of the independent variable x
It is known that the circumference of a rectangle is 12cm. Let one side of the rectangle be xcm, then its area is YCM. The analytic expression of the function of X is (), and the value range of the independent variable x
0.5 to the power of 99 * 16 to the power of 25
99th power of 0.5 * 25th power of 16 = 100th power of 0.5 / 100th power of 0.5 * 4 = (0.5 × 4) 100th power / 100th power of 0.5 = 2 / 101th power of 0.5 = 2
The charging standard of taxi in Nanjing is: the starting price is 7 yuan, no more than 7 yuan for 3000 meters. After 3000 meters, 1.4 yuan per kilometer, less than one meter is calculated as one kilometer
How much is Xiaoming's fare when he takes a bus x km
When x is less than 3km, the fare is 7 yuan; when x is more than 3km, the fare is 7 + 1.4 (x-3) = 7 + 1.4x-4.2 = 2.8 + 1.4x yuan
As shown in the figure, there are two straight highways (BD and EF, regardless of their width) passing through a rectangular land ABCD. It is known that EF is the vertical bisector of BD, with BD = 400m and EF = 300m. Calculate the area of this rectangular land ABCD
Connect De, BF. ∵ quadrilateral ABCD is rectangle, ∵ ab ∥ CD. ∠ ODF = ∠ OBE ∵ EF bisects BD vertically, ∵ od = ob ≌ DOF ≌ BOE (ASA) ≌ DF = be ≌ quadrilateral bfde is parallelogram. ∵ EF bisects BD vertically, FD = FB vertically (the distance from the point on the vertical bisector of the line segment to the point at both ends of the segment is equal) ∵ parallelogram bfde is diamond ≌ DF = BF = de = EB, OE = of =OD2 + of2 = (12 (12 × 400) + (12 × 300) 2 = 250, ｜ s Diamond debf = 12bd · EF = DF · BC ｜ 12 × 400 × 300 = 250 · BC ｜ BC = 240 in RT △ BCF, FC = BF2 − BC2 = 2502 − 2402 = 70, ｜ CD = DF + FC = 250 + 70 = 320, ｜ s rectangular ABCD = CD · BC = 320 × 240 = 76800m2 A: the area of ABCD in this rectangular land is 76800m2
There are two pencils in the bottom layer of a V-shaped shelf for stacking pencils. Each layer up puts two more pencils than the bottom layer, and the top layer puts 120 pencils
How many pencils are on the shelf
Number of floors: 120 △ 2 = 60
There are: (2 + 120) × 60 △ 2 = 3660
The taxi charging standard in Beijing is: the starting price (within 3 km) is 13 yuan, the part over 3 km is 2.3 yuan per km, and the fuel cost is 1 yuan per time,
Xiao Ming paid 32.4 yuan for the journey of X (x > 3) kilometers. What was the distance he took?
(32.4-13-1)÷2.3+3
=18.4÷2.3+3
=8+3
=11 km
RELATED INFORMATIONS
- 1. It is known that there is an inscribed cube in the hemisphere. The ratio of the volume of the hemisphere to the volume of the cube is calculated It is known that there is an inscribed cube in the hemisphere, and the ratio of the volume of the hemisphere to that of the cube is calculated
- 2. Simple operation 14 + 15 + 16 +How much is 45 + 46?
- 3. Finding the derivative of X / SiNx
- 4. Given that the image of the function y = 3x + 2B intersects with the image of the function y = - 4x-1 / 2A at a point on the Y axis, the value of 3a:2b is equal to____
- 5. Is that density?
- 6. In (), fill in the appropriate length unit 1 () - 1 () = 9 1 () - 1 () = 99 1 () - 1 () = 999
- 7. What is the axis of symmetry from F (2x-1) to f (x)?
- 8. It is known that the image of inverse scale function y = KX (k is a constant, K ≠ 0) is in the first and third quadrants. Please write a value of K that meets the above conditions______ (the answer is not unique)
- 9. On the 1:5000 scale drawing of a rectangular playground, the length of the rectangle is 5cm and the width is 4cm. How many meters is the actual perimeter of the rectangular playground
- 10. As shown in the figure, in △ ABC, D is the point on AB, and ad = AC, AE ⊥ CD, the perpendicular foot is e, and F is the midpoint of CB
- 11. For a two digit number, the sum of ten digits and one digit number is 11. If you transpose ten digits and one digit number, the two digit number will be 63% larger than the original number KTYKTU
- 12. 4x-3 (20-x) = - 4 solution equation
- 13. (1) There are many advantages to exercise. Let's look for them together: they can enhance our immunity and keep us energetic (2) There are many ways to keep fit. Which are suitable for us? Skipping rope, shuttlecock, badminton and running
- 14. Find the maximum and minimum value of the function y = 8 + 2x-x ^ 2 in the interval [- 1,2]
- 15. If S3 = 1 and S6 = 9, then A1 =? Q =?
- 16. (1) Line segments AC and BC are on the same line, AC = 6cm, BC = 2cm, and the distance between the midpoint of line segments AB and BC is?
- 17. There are 10 natural numbers in a row. Starting from the third, each number is equal to the sum of the two numbers before it There are 10 natural numbers in a row. Starting from the third, each number is equal to the sum of the two numbers in front of it. The sum of these 10 numbers is 2002. What is the seventh number
- 18. One pool has a storage capacity of 20 cubic meters, and a water pipe is used to inject water into the pool at the speed of 5 cubic meters per hour. At the same time, another drainage pipe is used to drain water out of the pool at the speed of 6 cubic meters per hour. (1) write the relationship between the storage capacity V (M3) of the pool and the inflow time t (hour) (pay attention to the value range of the independent variable); (2) when is the water in the pool drained?
- 19. The n power of 2 multiplied by the n power of 3 multiplied by the N + 2 power of 5 divided by the n power of 30,
- 20. Let a > b > 0 and ab = 2, then the minimum value of a ^ 2 + [1 / a (a-b)] is