Is f (x) = loga 2x a logarithmic function? Are f (x) = loga 2x and f (x) = 3loga 2 logarithmic functions?

Is f (x) = loga 2x a logarithmic function? Are f (x) = loga 2x and f (x) = 3loga 2 logarithmic functions?

The concept of logarithmic function is: logax (a > 0, a is not equal to 1) is called logarithmic function
So the first one is
The second 3loga 2 can be written as loga 2 ＾ 3
as well as
loga 8
So the second one is the same

Is y = loga (x square + 2x + 3) a logarithmic function

The logarithmic function is defined as y = loga (x) (a > 0 and a ≠ 1)
Y = loga (x squared + 2x + 3) is not a logarithmic function

The internal resistance Rg of the galvanometer is 1000 Ω, and the full bias current LG is 1mA. The modified voltmeter has two gears. When connected to the 0 and 1 gears, the range of the modified voltmeter is 3V
When connected to 0 and 2, the range of the modified voltmeter is 15V, and the resistance values of R1 and R2 are calculated

15 / 0.001 = 15K ohm; 3 / 0.01 = 3K ohm; so R1 = 3-1 = 2K ohm; R2 = 15-r1-1 = 12K ohm

9. Xiao Li wants to type a 12000 word document. On the first day, she types for 2 hours at a speed of W / min. on the second day, her typing speed is 10 minutes / min faster than that on the first day. After typing all the documents in two days, how long does it take her to type on the second day?
11. There are four small venues: the first is a square with a meter side length, the second is a square with a meter side length, and the rest are rectangles with a meter length and B meter width. Another large rectangular venue has an area equal to the sum of the above four venues. Its length is 2 (a + b) meters, which is the same as the simplest formula to express the width of the large rectangle. [40 points]
If you write down your thoughts, I will get the answer tonight!

9. Xiao Li wants to type a 12000 word document. On the first day, she types for 2 hours at a speed of W / min. on the second day, her typing speed is 10 minutes / min faster than that on the first day. After typing all the documents in two days, how long does it take her to type on the second day
First calculate the number of words typed on the first day:
2×60×W
Then figure out how many words are left
12000-（2×60×W）
Then the speed of typing the next day:
(W + 10) / min
Finally, calculate the typing time of the next day:
[12000 - (2 × 60 × w)] / (W + 10) minutes
If you ask how many hours you need to convert minutes into hours!
11. There are four small venues: the first is a square with a meter side length, the second is a square with a meter side length, and the rest are rectangles with a meter length and B meter width. Another large rectangular venue has an area equal to the sum of the above four venues. Its length is 2 (a + b) meters, which is the same as the simplest formula to express the width of the large rectangle. [40 points]
The area of the first land is S1 = a ^ 2
The area of the second plot is S2 = B ^ 2
The area of the third plot is S3 = ab
Area of the fourth plot S4 = ab
The largest piece of land = a ^ 2 + B ^ 2 + 2Ab = (a + b) ^ 2, length = 2 (a + b)
Then width = (a + b) / 2

Education and Science Edition

In the second year of junior high school: = u / r u = IR r = u / I P = w / T P = UI P = u ^ / R P = I ^ R q = uitphysical quantity physical formula current definition I = q / T Ohm's law I = u / R series circuit I = I1 = I2 parallel circuit I = I1 + I2 voltage series circuit u = U1 + U2 parallel circuit u = U1 = U2 resistance series R total = R1 + R2 Parallel R total = r1r

Life is full of beauty
600 words composition

Life is a palette to decorate the picture of life more delicately; life is a bottle of seasoning to make the meal of life more beautiful; life is a pen to write the book of life beautifully. I love life. In my opinion, life is beautiful everywhere. In the morning, when the sun is the first ray of sunshine

How is Joule calculated?

Joule is the international unit of heat, energy and work
Joule is defined as the work of 1 Newton force to move an object 1 meter
1 joule = 1 nm = watt seconds = 0.24 cal

2a²+4ab+2b²-8c²

Original formula = 2 (A & # 178; + 2Ab + B & # 178; - 4C & # 178;)
=2[(a+b)²-4c²]
=2(a+b+2c)(a+b-2c)

There is a DC motor winding coil resistance is 8 ohm, he connected to the 110V circuit, normal work through the point six 2A
What is the converted mechanical energy power and the converted thermal power

Converted thermal power = current square * resistance = 4 * 8 = 32 watts
Converted mechanical power = current square * equivalent inductive reactance
Equivalent inductive reactance = [(total voltage / total current) square resistance square] root
=[(110 / 2) square-64] square root = (55 * 55-64) square root = 54.415
Mechanical power = 2 * 2 * 54.415 = 217.66w

The height of a lamp from the ground is h, and the height of a person is L. the person walks at a constant speed V, as shown in the figure. (1) try to prove that the shadow on the top of the person's head moves at a constant speed. (2) find out the change rate of the length of the shadow with time

(12 points) (1) when t = 0, the person is at o right below the street lamp. At t, the person goes to S. according to the meaning of the question: OS = ν t ① The intersection point m between the crossing lamp P and the line on the top of the human head and the ground is the position of the shadow on the top of the human head at the time T. as shown in the figure, OM is the distance from the shadow on the top of the human head to point O. the geometric relationship is: H