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"24" point game, with 2, 6, 9, 9 together into 24 points (each number only once), the formula is______ .
From the meaning of the question, we can see that: ∵ 242 = 12, 9 + 9-6 = 12, ∵ 24 = 2 × 12 = 2 × (9 + 9-6), so the formula is (9 + 9-6) × 2
How to solve the approximate value of root 65 to the sixth power
65^(1/6)=(64+1)^(1/6)=2*(1+1/64)^(1/6)=2[1+(1/64)(1/6)+… ]≈2[1+(1/64)(1/6)]
The approximate value of 255 root to the fourth power?
The approximate value of the square root of 255 is 4
(4²)²=16²=256
pass by
4*4*4*4=16*16=256
So the approximate value of 255 root to the fourth power is 4
three point nine nine six zero eight eight one four eight eight zero four six seven
The root sign of 996 to the third power = (1000 * (1-4 / 1000)) to the third power = 10 * (1-4 / 3000) = the derivative of 9. Then take a x0, which can be used to find the approximate value of the function. See people's education press
three point nine nine six
About 3.99
4^4=256
So it's four
How to solve ∫ (arcsinx / x2 radical 1-x2) DX integral?
∫ Xe ＾ X / radical (E ＾ x-1) DX =
In the international system of units, the units of electric work and energy are ()
A. Joule B. kilowatt C. kilowatt h D. degree
A. The unit of electric energy is in accordance with the unit of electric energy
Mixed operation of addition, subtraction, multiplication and division of rational numbers
Given that the function FX = x2 + 2 (A-1) x + 2 is a decreasing function from the interval negative infinity to 4, find the value range of real number a
When ∵ f (x) = x & # 178; + 2 (A-1) x + 2 ∵ x ∈ (- infinity, 1-A), f (x) is a decreasing function
∵ f (x) is a decreasing function ∵ 1-A ≥ 4 in X ∈ (- ∞, 4), i.e. a ≤ - 3
The international unit of electric current is ----- for short, the symbol is----
Symbol: I
SI unit: a (a) MA (MA) μ a (micro a)
Conversion relation: 1A = 1000mA, 1mA = 1000 μ a, 1ka = 1000A
Please make up a rational number mixed operation problem, and the following conditions must be met at the same time: 1
The title is incomplete
2+2*2-2÷2⑵=5.5
（2+3.5-5）*5^5
Use a calculator to calculate the answers
RELATED INFORMATIONS
- 1. ∫ x radical (2x-x ^ 2) DX
- 2. Given that points a, B and C are three points on the number axis, the number corresponding to point C is 6, BC = 4, ab = 12. (1) find the number corresponding to points a and B. (2) the moving points P and Q start from a and C at the same time. They move along the positive direction of the number axis at the speed of 6 units per second and 3 units per second, respectively. M is the midpoint of a and P, n is on C and Q, and CN = one third CQ. Let t (T > 0) be the moving time, When the number corresponding to n (expressed by the formula containing T) is the value of T, OM = 2bn
- 3. As shown in the figure, it is known that A.B.C is three points on the number axis, and the number represented by point C is 6, BC = 4, ab = 12 The moving point P.Q starts from A.C. at the same time, the point P-2 unit length per second has a uniform speed of work along the number axis, and the point Q-1 unit length per second has a uniform speed of work along the number axis to the left. Suppose the movement time is t (T > 0), and what is the value of T, one of the three points o and P.Q is exactly the midpoint of the line segment connected by the other two points
- 4. As shown in the figure, point C is on the number axis, and AC: BC = 1:5, find the number corresponding to point C. 2) if a starts from a and B at the same time, the speed of a is 3 times slower than that of A Bit / s, meet 2 units from the origin, the equation graph is a straight line, a is - 10, B is 14
- 5. On the number axis, O is the origin, a and B are - 8 and 2, respectively 1. Finding the length of ab 2. The moving point P starts from a and moves to the right along the number axis with a speed of 3 unit lengths per second; meanwhile, the moving point Q starts from B and moves to the left along the number axis with a speed of 1 unit length per second. When P and Q coincide, the two points stop moving at the same time. Let the movement time of the two points be T seconds, and a formula containing t be used to express the length of the segment PQ 3. Under the condition of (2), the distance from point P and Q to origin o is equal when t is the value And do timely explanation, the more detailed the better, 3Q~
- 6. On the number axis, points a and B represent rational numbers a and B respectively, and the origin o is just the midpoint of AB, then the value of (a + b) 100 + (A / b) 2008 is (a + b) 100 (A / b) 2008
- 7. On the number axis, the distance from point a to the origin is 3, and the distance from point B to the origin is 4
- 8. A point on the number axis that represents an integer is called an integral point. The unit length of a certain number axis is 1 cm. If you draw a line AB with the length of 2008 cm randomly on the number axis
- 9. On the number axis, point a stands for negative 6, and point B stands for positive 4. Please divide line AB into five equal parts, and the point is cdef from left to right. Write down the numbers they represent
- 10. The moving point a starts from the origin and moves along the negative direction of the number axis, while the moving point C on the number axis always moves along the number axis at a speed of 10 unit length / s Moving point a starts from the origin and moves in the negative direction along the number axis, while moving point B also starts from the origin and moves in the positive direction along the number axis. After 4 seconds, the two points are 20 unit lengths apart. It is known that the velocity ratio of moving point a and B is 2:3 (1). Calculate the velocity of two moving points (2). If two points a and B start from the positions marked in (1) at the same time, they move in the negative direction along the number axis according to the original velocity, A few seconds later, the origin is just in the middle of the two moving points (3) on the number axis, and the moving point C has been moving along the number axis at a speed of 10 unit length / second. When a and B start from the position marked in (1) and move in the negative direction of the number axis, the moving point will catch up with a and then return to B, and then reverse a when B meets. In this way, when B catches up with a, C stops moving immediately, How many unit lengths does point C move
- 11. (1) 2, - 4,8,11 use these four numbers to do a 24 point game (2) and the other four numbers 3, - 7,8,13 can be made equal to 24 by ()
- 12. 7 6 2 8 9 1 6 2 is 24 points Space in the middle
- 13. My mother loves singing very much
- 14. A very interesting playground
- 15. Her mother walks to work every day
- 16. Xiaohong, Xiaohua and Xiaoli go to the bookstore together to buy the same book. If each person buys one book, Xiaohong's difference is 2.4 yuan, Xiaohua's difference is 4.5 yuan, and Xiaoli's difference is 0.5 yuan; If the sum of three people's money is just enough to buy two books, then one book is () yuan, and Xiao Li brings () yuan more than Xiao Hong?
- 17. One day, Xiaohong and Xiaoli used the temperature difference to measure the height of the mountain. Xiaohong measured the temperature at the top of the mountain to be - 4 ℃, and Xiaoli measured the temperature at the foot of the mountain to be 6 ℃. It is known that every 100 meters increase in the height of the area, the temperature will decrease by about 0.8 ℃, and the height of the mountain is about 10 ℃______ Rice
- 18. The ratio of extracurricular books between Xiaohong and Xiaoli is 2:1. If Xiaohong lends 11 books to Xiaoli, the ratio of extracurricular books between Xiaohong and Xiaoli is 7:20 How many extra-curricular books did Xiao Hong and Xiao Li have?
- 19. Xiao Li's family will travel from Xi'an to Harbin, while Xiao Hua's family will go on holiday from Harbin to Xi'an Xiaoli's family will travel from Xi'an to Harbin, and Xiaohua's family will take a vacation from Harbin to Xi'an. The railway from Xi'an to Harbin is about 2600 kilometers long. At 8 a.m. on New Year's day, Xiaoli's family will start from Xi'an by train, which runs 60 kilometers per hour. At the same time, Xiaohua's family will start from Harbin by train, which runs 70 kilometers per hour, The two trains meet?
- 20. Is there any contradiction between electric work formula and electric heating formula Electric work formula: w = uit Electrothermal formula: q = I & # 178; RT For the pure resistance circuit, all the electric energy is converted into heat energy, w = Q For the non pure resistance circuit, part of the electric energy is converted into heat energy, w > Q According to Ohm's law, I = u / R, w = uit = u & # 178; t / R, q = I & # 178; RT = u & # 178; t / R, w = Q So how does w > Q come from? Is Ohm's law invalid for non pure resistance circuit?