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Given the function f (x) = ax & # 178; + x-a, a ≥ 0, find the solution set of the inequality f (x) > 1,
How to calculate the power consumption of household appliances? For example, how much is the power consumption of a 1200W electric water heater? That is, how long can a kilowatt hour of electricity last? What is the calculation formula
Power consumption is based on "kilowatt hour (KWH)" as the unit, commonly known as "degree". The service time of 1 kW electrical equipment is one hour, and the power consumption means "1 kwh", that is, one degree of electricity
The power consumption of 1200W electric water heater is 1.2kW * 1H = 1.2kw/h
That's 1.2 kilowatts an hour
1+3+4+6+7+9+10+12+13+…… +How about 36 + 37 + 39 + 40, thank you
The original formula = (1 + 40) · 40 / 2 = 820. This problem belongs to the summation of sequence, and its formula is: (first term + last term) · number of terms
I bought a Yadi electric car with a 72V battery and an 800W motor. After 4 days of charging, the battery is still full. It's about 60km
Do you need to charge now? How often do I charge my car? I ride it every day
Again, is the quality of this kind of electric car good? Power and so on
The sales volume of Yadi is the first, and it is also the first in the light industry electric vehicle industry. If you ride 72V like this, it is estimated that it will be charged once a week·······
Simple calculation of 999 plus 999 times 999
This is how to understand the original question: 999 + 999 * 999
Original formula = 999 (999 + 1)
＝999000
Does gravity affect all objects on the earth's surface?
Does gravity affect all objects on the earth?
Today, I thought of a strange question in physics class
If gravity has an effect on all objects on the earth, why is the air still floating?
If we think in this direction, shouldn't the air be pressed to the surface of the earth?
Because I am rather stupid, I always think about some inexplicable questions. However, I think it is necessary to ask this question,
If gravity has an effect on all objects on the earth, why is the air still floating?
If we think in this direction, shouldn't the air be pressed to the surface of the earth?
Air is composed of molecules invisible to the naked eye. It moves irregularly without stop. Although the distance between molecules is larger than that of solids and liquids, the number of molecules is still larger. Due to continuous collision due to motion, the collision force can not be ignored, which is enough to balance gravity. Therefore, the phenomenon that "air should not be pressed into a layer to stick to the surface of the earth" will not appear
A simple algorithm of 125 times 25 times 8 times 4
125×25×8×4
=（125×8）×（25×4）
=1000×100
=100000
The resistance of a conductor is 40 ohm, and the current through it is 100 mA. How many volts is the voltage at both ends of the conductor?
There is another circuit, R1 is 20 ohm, the total resistance of the circuit is 12 ohm, and the current index is 0.3A
Calculation. Resistance value of resistance R2; supply voltage
fast
Fast people have more rewards!
40*0.1=4V
1/R1+1/R2=1/R
R2 = 30 ohm
U=IR=0.3*12=3.6V
Two practical problems of linear equation of one variable in grade one of junior high school
1. Zhao Hong bought a notebook for her class as a prize for the new year's party. She bought 36 notebooks with two specifications. The unit price is 1.8 yuan and 2.6 yuan respectively. When she went, she took 100 yuan and got 27.6 yuan back. Zhao Hong found that it was wrong because he took the original 2 yuan in his pocket as the money to get back. Please calculate how many notebooks she bought for each of the two types. Is it possible to get 27.6 yuan back now?
2. Pythagoras was asked, dear Mr. Pythagoras, please tell me how many students are attending classes in your school. Pythagoras replied that there are so many students attending classes. One half of them are studying mathematics, one fourth are studying music, and one seventh are silent. In addition, three women asked how many students are attending classes?
1. If you buy x laptops for 1.8 yuan, then (36-x) laptops for 2.6 yuan
From question 1.8x + 2.6 (36-x) = 100-27.6 + 2
The solution is x = 24, that is, 24 copies for 1.8 yuan and 12 copies for 2.6 yuan
If 27.6 yuan is recovered, 1.8x + 2.6 (36-x) = 100-27.6 yuan
The solution is x = 26.5, which is not suitable for the problem
2. There are x people in the class
Then the solution of 1 / 2x + 1 / 4x + 1 / 7X + 3 = x is x = 28
It's not necessarily right
What diameter of pipe need support
The installation budget of pipe support is calculated by weight, but the quota already includes the calculation of DN32 pipe support. The estimated length of pipe divided by the distance of support multiplied by the weight of support. The distance of pipe support is as follows (m)
The pipe diameter is more than 15 20 25 32 40 50 65 (80, 100) 125
Non thermal insulation 2.5 3 3.5 4 4.5 6
Insulation 1.5 2.5 3 4 6
This does not mean that the quota below 32 has been included / why is there a 15-32 bracket spacing here?
What you listed is the pipe distance and support table, which has nothing to do with the budget
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- 3. Print out all the Narcissus numbers in the range of 100-999 (the sum of the cubes of a three digit number equals itself), for example, 153 = 1 ^ 3 + 5 ^ 3 + 3 ^ 3
- 4. Given X & # 178; + Y & # 178; = 13. X + y = 4, then xy =?
- 5. Column: 10000-0 (absolutely safe) 7 divided by 2 (no three no four) Q: eight out of seven ()
- 6. 10000-0 (absolutely safe) 1 / 100 (one in a hundred) 1000 & # 178; = 100 × 100 () 、）
- 7. What is 99 + 100 + 101 + 102 +... + 998 + 999,
- 8. Primary school simple calculation (1) 1 × 27 of 5 + 3 × 41 of 5 (2) 9 + 99 + 999 + 9999 (3) 135 △ 12.5 (4) 1325-998 (5) 34 × 2 and 13 of 34 Please master (1) 1 / 5 × 27 + 3 / 5 × 41 （2）9+99+999+9999 (3)135÷12.5 （4）1325-998 (5) 34 × 2 and 13 / 34 Answer as many questions as you can
- 9. Simple calculation of 999-98 + 37 + 6
- 10. (2x 3Y) & # 178; + 2 (2x 3Y) - 4 = 0, then the value of 2x + 3Y is
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- 19. 1+2+3+4+5+6… ... + 99 with simple calculation
- 20. Questions about expansion of function into power series In the part of learning Taylor's formula, we know that if the function f (x) has a derivative up to (n + 1) order in a neighborhood of x0, then the n-order Taylor's formula of F (x) in that neighborhood is a polynomial + RN (x) remainder term. This formula should be constant as long as the function f (x) has a derivative up to (n + 1) order in a neighborhood of x0, But if f (x) has all order derivatives in a neighborhood of x0, we can write down the polynomial infinitely, that is, f (x) = polynomial (infinite term), then the corresponding formula should also be tenable, as long as f (x) has all order derivatives in a neighborhood of x0, and the function is in this neighborhood? If I'm right, Then look at the following But why does the expansion of a function into a power series only hold in the common part of the convergence domain of the series and the definition domain of the function? For example, 1 / 1-x = 1 + X + x ^ 2 +. + x ^ n +... Only in (- 1