It is proved by syllogism that the sequence of general term formula an = A1 = (n-1) d (A1, D are constants) is equal difference sequence

It is proved by syllogism that the sequence of general term formula an = A1 = (n-1) d (A1, D are constants) is equal difference sequence

The second = sign is the + sign, right?
The sequence of general term ar = as + (R-S) d is the arithmetic sequence, and the arithmetic is d;
And an satisfies the condition of general term ar,
Then an is also an arithmetic sequence
There are many formulas of physical electric work and electric power. How to remember them? What's a good way to understand them
In fact, don't you think that the more formulas you have, the better you can use them? I want to keep those formulas in mind. In this way, when you do a problem, you should first write the formula and substitute it into the formula according to the known conditions. If this one doesn't work, you can take another one, such as P = UI, P = w / T, P = I ^ 2 · R, P = u ^ 2 / R. for example, if you go to a place, you can only go one way
You just have to remember these two common elements and add the ohmic constant to deduce it
The sum of W = IUT and P = IU and Ohm's law can be deduced
The most primitive Ohm's law, coupled with the energy formula, can deduce all the formulas. Recommend a good book. It's called basic physics. Author Harold has bought it or borrowed it from the library.... Classics in classics.. Your teacher may not have seen it. You can also ask him the questions in it....
If the area of a triangle is known to be a fixed value s, then the functional relation between the height h and the base a of the triangle is h=______ And then h is of A______ Function
The function relation between the height h and the base a of a triangle is h = 2Sa. Since s is a fixed value, h is the inverse proportion function of A. therefore, the answer to this question is: H = 2Sa; inverse proportion
In the sequence an, we know A1 = 1 an + 1 = 2An / an + 2 (n belongs to n *). We prove that 1 / an is an arithmetic sequence and find the general formula of an
an+1=2an/an+2
1/a(n+1)=(an+2)/2an=an/2an+2/2an
So 1 / a (n + 1) = 1 / 2 + 1 / an
1 / a (n + 1) - 1 / an = 1 / 2 is a constant
So 1 / an is an arithmetic sequence
1/a(n+1)-1/an=1/2
So d = 1 / 2
1/a1=1
So 1 / an = 1 + 1 / 2 (n-1) = (n + 1) / 2
So an = 2 / (n + 1)
The formula of physical electric work and electric power in grade three of junior high school
Please divide the respondents into two groups to answer, that is, electric work: + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + +++++++++
For all the formulas in the third grade of junior high school, it's unnecessary for those beyond the scope. It seems that there are 6 electric work and 4 electric power? -- forget it
P = UI. P = u ^ 2 / R. P = I ^ 2R. W = uit. W = I ^ 2rt. W = Pt. In fact, as long as you remember Ohm's law again, I = u / R transformation can get more formulas. Remember that if you use Ohm's law in pure resistance, remember to give points
Given that the area of the triangle ABC is equal to 2, let the length of one side of the triangle be x and the height of the triangle be y, then the image of the function of Y with respect to X is
0.5 * x * y = 2, that is, y = 4 * (1 / x). Because both X and y are greater than zero, the hyperbola of the first quadrant is used to draw the point x = 1, y = 4; X = 4, y = 1
x*y=1。。。。 Go and draw by yourself. Question: I just can't draw
Given that the general term formula of arithmetic sequence {an} is an = 2N-1, find the first term A1 and tolerance D
Generation n = 1 A1 = 1
D=2
a1=1
D=2
Electric energy, electric power,
Parallel, P, R inverse ratio, series P, R proportional
How can we get this conclusion? Is p = u squared / r used in series? P = I squared r used in parallel
This conclusion depends on the specific circuit situation. If two resistors are simply connected in parallel, the voltage at both ends of the parallel resistor is equal, so p = u square / R is used; if two resistors are simply connected in series, because the resistance values of the two resistors in series are equal, so p = I square R is used; in this way, the two
P = u squared / R for parallel connection. Because the parallel circuits have the same voltage.
P = I square R is used in series. Because the currents in series circuits are equal.
It is series partial pressure shunt. In series circuit, u = U1 + U2 + +In parallel circuit, I = I1 + I2 + +In
In series U1：U2=R1：R2。 When the current of series circuit is constant, the voltage ratio is equal to the current ratio. P1：P2=R1：R2。 From the formula. The electric power is equal to the square of the current multiplied by the resistance, and the current is constant. The series circuit is simple. All of the above are proportional. In parallel, the voltage of each branch is the same. I1: I2 equals R2 to R1. This is an inverse ratio, and the ratio of electric power is also an inverse ratio. According to the formula, electric power equals the square of voltage divided by resistance. Forget to adopt, hand... Unfold
It is series partial pressure shunt. In series circuit, u = U1 + U2 + +In parallel circuit, I = I1 + I2 + +In
In series U1：U2=R1：R2。 When the current of series circuit is constant, the voltage ratio is equal to the current ratio. P1：P2=R1：R2。 From the formula. The electric power is equal to the square of the current multiplied by the resistance, and the current is constant. The series circuit is simple. All of the above are proportional. In parallel, the voltage of each branch is the same. I1: I2 equals R2 to R1. This is an inverse ratio, and the ratio of electric power is also an inverse ratio. According to the formula, electric power equals the square of voltage divided by resistance. Forget to adopt, cell phone call, tired. Follow up question: you said it in a mess... One by one, one by one. I have to give a compliment to comfort you..
In △ ABC, ∠ C = 60 °, BC = a, AC = B, a + B = 16. (1) try to write the functional relationship between the area s of △ ABC and the side length A. (2) when a is equal to what, s has the maximum value? And find the maximum value
(1) ∵ a + B = 16, ∵ B = 16-a (0 ＜ a ＜ 16) s = 12a (16-a) sin60 ° = 34 (16a-a2) = - 34 (A-8) 2 + 163 (0 ＜ a ＜ 16) (2) from (1), when a = 8, s has a maximum value of 163
Given the arithmetic sequence an, where a1 = 31, tolerance d = - 8 1. Find the general term formula of the sequence an 2. From which term the sequence an starts to be less than 0 3. Find the maximum value of the sequence
an=a1+(n-1)d
an=31+(n-1)*-8
=-8n+39
-8N + 394 n = 5 item 5
The maximum value is A1 = 31, which is getting smaller later
1. an=39-8d
2. n=5
3. N = 1 is the maximum of 31
Hello:
One
an=39-8n (n∈N+)
Two
39-8n＜3
8n＞36
n＞4.5
So item 5 starts less than 3
Three
Because it's a decreasing sequence
So when n = 1, the sequence has a maximum of 31
_________________
|This process has been quite detailed|
|If there's something you can't understand|
... unfold
Hello:
One
an=39-8n (n∈N+)
Two
39-8n＜3
8n＞36
n＞4.5
So item 5 starts less than 3
Three
Because it's a decreasing sequence
So when n = 1, the sequence has a maximum of 31
_________________
|This process has been quite detailed|
|If there's something you can't understand|
|Please ask me? Thank you|
¯
an=112-8n。 Second. Thirty-one