![](data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" viewBox="0 0 72 71" width="72"></svg>)
It's 70 degrees, 25 minutes, 12 seconds,
12 seconds = 12 △ 60 = 0.2 minutes
25.2 points = 25.2 △ 60 = 0.42 degrees
70 degrees 25 minutes 12 seconds = 70.42 degrees
The cost represents 78 degrees, 25 minutes and 12 seconds respectively
12 seconds = 12 △ 60 = 0.2 minutes
25.2 points = 25.2 △ 60 = 0.42 degrees
78 degrees 25 minutes 12 seconds = 78.42 degrees
What is the angle α equal to here?
If there is a point P (cospai / 5, sinpai / 5) on the terminal edge of angle α, then α = ()
A.pai/5
B.tanpai/5
C. 2kpai + 3pai / 10 (k is an integer)
D. 2kpai-9pai / 5 (k is an integer)
Please explain why,
tanα=y/x=(sinpai/5)/(cospai/5)=tanpai/5
So α = Pai / 5
A
For high school compulsory one chemistry (molar part), physics (acceleration and other first two units) PEP all formulas
I don't know what textbooks, extracurricular, a lot of... By the way, write what each letter stands for
N (amount of substance) = n (number of substance particles) / Na (Avogadro constant 6.02 * 10 (23rd power)) = m (mass of substance) / M (molar mass of substance) gas: under standard condition, n = V (volume of substance) / VM (molar volume of gas under standard condition, i.e. 22.4l / mol-1) solution: C (concentration of solution) = n
It is known that the equation (x + A / x) ^ 2-5x-5a / x = - 6 has two equal roots. Find the value of A
It is known that the equation [x + (A / x)] ^ 2-5x - (5A / x) = - 6 about X has two equal roots. Find the value of A
emergency
Let y = x + A / x, then y ^ 2-5y = - 6
Y = 2 or y = 3
When x + A / x = 2, x ^ 2-2x + a = 0, the two are equal, and a = 1 is obtained from Veda's theorem
When x + A / x = 3, x ^ 2-3x + a = 0, two equal, a = 2.25
Solve an equation: 9 / 5 * x + 6 = 2 / 3 * x, please
Write the process
9 of 5 * x + 6 = 2 of 3 * x X5 / 9-x2 / 3 = - 6 - X1 / 9 = - 6 x = 54
How much is the multiplication of 2x & # 178; - 84x + 113 = 0 cross
Anything will do
Can not cross multiplication, because 113 is a prime number (can refer to "prime number" Baidu Encyclopedia), so 113 decomposition does not open, can not cross multiplication!
Point P is in the third quadrant. The distance from point P to the x-axis is 2, and the distance to the y-axis is 3. Then the coordinate of M is
Point P is in the third quadrant. The distance from point P to X axis is 2, and the distance to y axis is 3. Then the coordinate of point m is
If the distance from point P to X axis is 2, then the ordinate of point P is 2, and point P is in the second quadrant
The distance from point P to y axis is 3, which means that the distance from point m to y axis is 3 and in the second quadrant
Then the coordinates of point m are (- 3,2)
If f (x) is an odd function with period 2 and the domain of definition is r, then f (1)=
T=2
So f (1) = f (1-2)
That is, f (1) = f (- 1)
Odd function then - f (1) = f (- 1)
So f (1) = - f (1)
f(1)=0
Given the function FX = 1 / x ^ - 2, find the domain of FX and prove that the function FX = 1 / x ^ - 2 is a decreasing function on (0, negative infinity)
X ^ - 2 ≠ 0, X ≠ 0, f (x) = 1 / x ^ - 2 = x ^ 2, let M0
F (m) > F (n), so f (x) is a decreasing function on (negative infinity, O)
RELATED INFORMATIONS
- 1. 33 ° and 25 ° 25 ′ 12 ″
- 2. The purchase price and selling price of the refrigerator and color TV of the designated model of "home appliances to the countryside" in Green Valley Shopping Mall are shown in the table below: the purchase price of the refrigerator and color TV of the category (yuan / set) is 23201900, and the selling price (yuan / set) is 24201980 (1) according to the national policy, farmers can enjoy the government subsidy of 13% of the selling price when they buy "home appliances to the countryside" Government subsidies? (2) In order to meet the needs of farmers, the shopping mall decided to purchase 40 refrigerators and color TV sets with no more than 85000 yuan, and the number of refrigerators is no less than 56% of the number of color TV sets. ① please help the shopping mall design the corresponding purchase plan; ② which purchase plan will the shopping mall get the most profit (profit = selling price purchase price), and what is the maximum profit?
- 3. If the square + 1 of the algebraic formula 4 * a plus a monomial form can form a complete square, then; [1] write all possible monomials in line with the meaning of the problem; [2] write all corresponding complete square forms
- 4. As shown in the figure, in the square ABCD, points E and f move on BC and CD respectively, but the distance ah from a to ef always keeps the same as AB, etc? Please explain the reason. (2) does the circumference of △ ECF change? Please give reasons
- 5. 1. Solve the equation X:Y=3:2 {Y:Z=5:4 X+Y+Z=66 2. In the equation y = ax ② + BX + C (x ② represents the quadratic power of x), when x = 1, y = - 4; when x = - 1, y = 0; when x = 2 and x = 0, the value of Y is equal. Find the value of a, B and C (the correct answer to the first question is x = 30, y = 20, z = 16; the correct answer to the second question is a = 1, B = - 2, C = - 3)!
- 6. Junior one math problem, urgent, then add 20 points! In April 2009, our city opened the "Shaoyang Shanghai" through train, which provided convenience for the residents of our city to travel and commercial transportation. It is understood that after the opening of the through train, our city's tourism company added 400 yuan to the price of "Shaoyang Shanghai" line (unit: yuan / person), 5 / 6 of the price before the opening of Jiangwei through train, and 13 yuan to the cost of Shanghai tourism, It's equivalent to the cost of four people traveling to Shanghai after the opening of the through train. Try to find out the quotation of our city's tourism company for the "Shaoyang Shanghai" line before and after the opening of the through train
- 7. Xiaohongjia painted her room in spring. She employed five workers and finished it in 10 days. She used 150 liters of certain paint at a cost of 4800 yuan and painted an area of 150m2. When she finally settled the payment, she had the following plans: Plan 1: 30 yuan for each worker; plan 2: 30% for each worker; plan 3: 30% for each worker According to the painting area, we pay 12 yuan per square meter. Please help xiaohongjia to choose______ It's the most economical (economical) to pay
- 8. There are "broadband network" and "dial-up network" for computer Internet access. The cost of dial-up network access consists of telephone fee and Internet fee. The former charging standard is: telephone fee 0.18 yuan / 3 minutes, Internet fee 7.2 yuan / hour. Now it is adjusted to: telephone fee 0.09 yuan / 3 minutes, Internet fee 4 yuan / hour. (1) before the tariff adjustment, the net name Zhang Yong was in his family budget, There has been a monthly expenditure of 70 hours on the Internet. How much is the budget? (2) after the tariff adjustment, the budget remains unchanged. How many hours can Zhang Yong surf the Internet every month at least?
- 9. Answers to page 30 of the mathematics exercise book of the people's Education Press
- 10. Questions 11, 12 and 13 on page 3 of mathematics exercise book for grade one of junior high school Question 12: there were (3a-b) passengers on the bus, half of them got off the bus, and some of them got on the bus. There were (8a-5b) passengers on the bus. How many passengers got on the bus Don't forget questions 11 and 12
- 11. I have questions (22 19:45:56) Put a coin at the bottom of the empty cup, move the cup so that the eyes can't see the coin. Keep this position unchanged, and slowly pour water into the cup. As the water rises, can you see the coin? Try to explain why, How to move the cup
- 12. 1. In our daily life, we often estimate the objects around us. The following four options are the results of a student's estimation. What do you think is the most unreasonable is -------- - (& # 160; & # 160; & # 160; & # 160;) &#A. generally speaking, the body temperature is 37 ℃. B. the speed of the champion of 100 meter race in the sports meeting is 54 km / h &#C. the weight of an egg is about 50g. D. the volume of a bottle of Wahaha Purified water is about 600ml
- 13. 1.38 degrees 48 minutes 18 seconds = how many degrees? 2.52.73 degrees = how many degrees, how many minutes, how many seconds? 3. (51 degrees 37 points + 32 degrees 49 points) * 2 4.51 degrees 37 minutes - 32 degrees 45 minutes 31 seconds It's not very clear here,
- 14. First grade mathematics degree minute second calculation problem 48°39'+67°41'= -78°19'40''=
- 15. When the altitude rises 1000 meters, the temperature change is - 6 degrees Celsius. When the ground temperature is 0 degrees Celsius, if the mountain height is 4000 meters, the mountain should be calculated What's the temperature at the top?
- 16. When the altitude increases by 1000 meters, the temperature will decrease by 5 degrees Celsius. Now the ground temperature is 8 degrees Celsius. What is the altitude temperature of 3000 meters?
- 17. A second problem about accuracy Fill in the blanks The accuracy of 8848.13 is up to________________ . It's 8848.13m I forgot my unit. I'm sorry
- 18. Sentence making and explanation of several words 1. Wanzhuan 2. Vigorous 3. Ancient times Make sentences 4. Dawn
- 19. What's the meaning of the beautiful word "Sheng"
- 20. &#Please write down the following sentences: the function of the quotation marks in the following sentences, please write down the following sentences: the function of the quotation marks in the following sentences: the # \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\theresults are as follows: 160; #; \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\; &# 160; &# 160; &# 160; &# 160; &# 160; &# 160; &# 160; &# 160; &# 160; &# 160; &# 160; the beginning of an article should be concise and clear, which is called "getting to the point" &#Some people on the bus, even though they haven't arrived at the bus stop, grab at the door of the bus, so as to get off the bus conveniently. It's better to have fewer "smart people"