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1. Write three fractions equal to three fifths. What is the sum of all the simplest true fractions with denominator 8?
Scores equal to 3 / 5: 6 / 10, 9 / 15, 12 / 20, 15 / 25, 18 / 30, 21 / 35, 24 / 40, 27 / 45, 30 / 50. The denominator is all the simplest scores of 8: 1 / 8, 3 / 8, 5 / 8, 7 / 8. The denominator is the sum of all the simplest scores of 8: 1 / 8 + 3 / 8 +
How many are the simplest true fractions whose denominator is 8?
1/8,3/8,5/8,7/8
There is a group of Coprime numbers, which are all composite numbers. Their least common multiple is 56. These two numbers are () and (), respectively
7 and 8
Where is 21 degrees 38 south latitude and 165 degrees 21 west longitude?
Between Niue and cook islands in New Zealand
The meaning of 21 degrees
This is a friend gave me the net name, ask him the meaning of 21 ℃ also don't tell me, let me guess
There will be two sentences in the explanation of 21 ℃. This is the hint he gave me
I only know that 21g is the weight of the soul. Everyone who loves others deeply will lose 21g after death. That 21g is the purest love in the world. Even if people go, they are still lovely. The reduced 21g will stay with the people they love forever
Right triangle: long side 57.6, one acute angle 21 degrees, another acute angle 69 degrees, find the value of two short sides
One short side = 57.6 * sin21 ° = 20.64
The other short side = 57.6 * sin69 ° = 53.77
According to the meteorological observation data of a certain place, the temperature will decrease by about 6 degrees for every 1km increase in altitude. If the surface temperature of the area is 21 degrees, the temperature of a place in the upper air is - 39 degrees
Why is that
【21-（-39）】/6=10km.
Why is that
According to the following formula, the temperature will decrease about 6 degrees for every 1km increase in altitude
So it's down from 21 degrees to - 39 degrees
Height difference (21 + 39) △ 6 = 10km
The observation data of a certain meteorological station show that the temperature decreases about 6 ℃ for every 1000 m increase in height. If the temperature at the bottom of a valley is 21 ℃, the temperature at the top of the mountain is - 9 ℃, the height of the mountain can be calculated
According to the meaning of the question: 21 − (− 9) 6 × 1000 = 5000 (meters). So the height of this place is 5000 meters. So the answer is 5000
If the ground temperature of the area is 21 degrees and the temperature of a place in the upper air is - 39 degrees, the height above the ground can be calculated
The power of rational numbers
It doesn't seem to be so troublesome. It's 10 kilometers above the ground
The meteorological observation data of a sounding balloon show that the air temperature decreases about 6 ℃ when the height increases by 1 kilometer. If the ground temperature is 21 ℃ and the temperature in the upper air is - 39 ℃, how many kilometers is the height?
∵ when the height increases by 1km, the temperature decreases by about 6 ℃, the surface temperature of a certain area is 21 ℃, the temperature of a place in the upper air is - 39 ℃, and the height of this place is: (- 39-21) / (- 6) × L = 10 (km)
RELATED INFORMATIONS
- 1. The meteorological observation data of the sounding balloon in a certain place shows that the temperature will decrease by about 6 ℃ for every 1 km increase in altitude. If the temperature in the region is 21 ℃ and the temperature in the upper air is minus 39 ℃, how many kilometers is the height obtained? There are some cards marked 6, 12, 18 and 24. The number on the last card is 6 larger than that on the previous card. Xiao Ming got three adjacent cards, and the sum of the numbers on these cards is 342 ① Which three cards did Xiao Ming get? ② Xiaohua said that he also got three adjacent cards, and the sum of the numbers on these cards is 86, do you believe it? We need to solve the equation Hurry!
- 2. Two pairs of logarithms are selected from 3 569 1015 to make their ratio equal to 1 / 3 Then choose two logarithms whose ratio is 1 / 2, and the composition ratio is () fast
- 3. Is to determine the number of real roots of the equation x plus the absolute value lgx equal to 2
- 4. If the equation (a-6) x2-8x + 6 = 0 of X has real roots, then the maximum value of integer a is () A. 6B. 7C. 8D. 9
- 5. If the nonempty set a = {x | 2A + 1 ≤ x ≤ 3a-5}, B = {x | 2 ≤ x ≤ 22}, what is the set of all real numbers a that can make a contained in B?
- 6. The point corresponding to complex number m ^ 2-3 + (2-m-m ^ 2) I on complex plane is in the second quadrant, and the value range of real number m is obtained
- 7. Y = SiNx + cosx 2. Y = SiNx · cosx + cosx 3. Y = SiNx + cosx - SiNx · cosx Better have a way!
- 8. If one root of the equation x squared - 2x + M = 0 is - 3, then what is the value of the other root () m
- 9. 1. The root of equation 2x (x-4) = 5 (x-4) is ()
- 10. The number of real roots of the equation x ^ 2 = 2 ^ x is
- 11. What is the nth number of regular numbers like - 1,2, - 4,8, - 16,32?
- 12. Mathematics problems in grade one of junior high school 1. Someone goes to catch the 10 o'clock train 20 minutes to 10 o'clock. It is known that his home is 10 kilometers away from the station. He leaves home for 5 minutes at a speed of 3 kilometers per hour. Then he takes a taxi to the station and asks how many kilometers the taxi should travel per hour at least so as not to delay the train? 2. There are 1530 tons of class a goods and 1150 tons of class B goods in Jingmen railway freight station. A freight car is arranged to transport these goods to Guangzhou. This freight car can carry 50 sections of a and B freight cars. It is known that 35 tons of class a freight car and 15 tons of class B freight car can fill one section of type a freight car, 25 tons of class a freight car and 35 tons of class B freight car can fill one section of type B freight car, How many transportation options are there?
- 13. 5 / 4 * (- 0.6) / (- 3's Square) + 2 / 3 * (- 4 / 5) =?
- 14. Calculate the 2n + 1 power of the 2nd power * (- XY) of [3 (- XY) to the nth power] (n is a positive integer)
- 15. 3 / 2 power of 36
- 16. A (A-3) + (2-A) (2 + a) is equal to? Simplification
- 17. log5(3)+log5(1/3)=? How to calculate
- 18. How to pronounce the English letter G, J and Z
- 19. What are the rules of Ou pronunciation in words? Why do you pronounce "Ou" differently in words such as "rough, mountain and you"?
- 20. On the pronunciation and words of a and ou Find as many words as possible:1 ) with letter A having different pronunciations; 2) with 'ou' having different pronunciations.