General term formula for 1,3,3,5,5,7,7,9,9

General term formula for 1,3,3,5,5,7,7,9,9

The simplest is
N = n, n is odd
N-1 n is even
The general term formula of solving sequence an in known sequence an of high school mathematics with A1 = 3 and an + 1 = 4An + 3
A is followed by the corner mark in the lower right corner
1+an+1=4an+3+1=4（an+1）
That is 1 + an + 1 / an + 1 = 4
an+1=（a1+1）*4n
an=4（n+1）-1
That N + 1 and N + 3 are under a, right~~~
A. If a and B are fixed, how to place the third point charge C to make the charge in equilibrium? Is there any requirement for the electrical property and quantity Q of C? (2) If a and B are free, how to place the third point charge to make the system in equilibrium? At this time, is there any requirement for the size and electrical property of the third point charge C?
(1) Because a and B are fixed, as long as the third point charge C is placed at the position where the electric field intensity is zero, so that the charge is in a state of equilibrium, so there is no requirement for the electrical property and quantity Q of C; (2) because a and B are both positive charges, C must be negatively charged, and between ab charges, due to the small amount of charge of B, C
When the total amount of work is fixed, what is the proportion between work efficiency and time
When the total amount of work is fixed, the work efficiency is inversely proportional to the time. The higher the work efficiency is, the less time is spent. On the contrary, the lower the work efficiency is, the more time is spent!
Calculation, formula and answer of Coulomb's law in vacuum,
Coulomb's law 1. Point charge A. when the size and shape of the charged body are much smaller than the distance of interaction, the charged body can be regarded as a point charge. B. the point charge is an idealized model
Practical problems of mathematical work efficiency
A new copier works three times as well as an old one. It only takes 12 minutes to copy documents when they work together. How much time do they need when they work alone?
Well, it's in the form:
Efficiency x time = total
New copier
Used Copier
Efficiency x time = total
New copier
Used Copier
Two working at the same time
The final formula is in the total column: new total + old total = total working at the same time
The working efficiency of the new copier is three times that of the old one, that is to say, it takes 12 minutes to copy with four old ones, that is to say, it takes 48 minutes to copy with one old copier. Similarly, one old copier is equivalent to one third of the new one, that is to say, it is equivalent to one and one third of the new one
A new copier works three times as well as an old one. When they work together, it only takes them 12 minutes to copy documents. How much time do they need when they work alone?
Well, it's in the form:
Efficiency x time = total
New copier
Efficiency x time = total quantity
New copier
Used Copier
Two working at the same time
The positive and negative of the root of quadratic equation with one variable
-Both a / b ＞ 0 and a / C ＞ 0 are positive
-A / b 〈 0, a / C 〉 0 is negative
A / C ＜ 0 - positive and negative
How is this pushed and calculated
In fact, it's very simple. First of all, you need to know what are the two roots of the quadratic equation with one variable, which should be similar to (- b)+_ B2-4ac root sign) / 2a, it's estimated that yes, I haven't played this for many years. Secondly, you need to know that if 2 roots are positive, then sum is positive, and product is also positive. If you add and multiply 2 representative formulas, the result will be your one
Is there any difference between the expression F of Coulomb's law of University and that of high school?
The R on the university is a vector indicating the direction of the force
Junior high school mathematics one variable quadratic equation (work efficiency) topic
Four days later, because group A has another task, group B will do it alone for another five days to complete the work. If the work is completed alone, group A will spend five days less than group B. the number of days required for each group to complete the work alone is calculated
It takes X days for Party A to complete alone, and X + 5 days for Party B
(4/X)+(4/X+5)+(5/X+5)=1
Find x = 10
So a uses 10 days, B uses 15 days
Why should the equation be such a column (4 / x) + (4 / x + 5) + (5 / x + 5) = 1
And can you explain how 1 comes from and what is the efficiency formula
If all work items are set to 1, then Party A completes 1 / X every day and Party B completes 1 / (x + 5) every day
The following is the formula according to the title