In the sequence {an}, A1 = 1, a (n + 1) = C * an + [n + 1 power of C * (2n + 1)], where the real number C is not equal to 0, then the general formula of an is?

This problem can be summarized according to the calculation results, and then proved by induction: A2 = C * a1 + [C ^ 2 * 3] = C + 3 * C ^ 2A3 = C * A2 + [C ^ 3 * 5] = C ^ 2 + 8 * C ^ 3A4 = C ^ 3 + 15C ^ 4A5 = C ^ 4 + 24C ^ 5 We can guess that an = C ^ (n-1) + (n ^ 2-1) * C ^ n. The following is proved by mathematical induction: when n = 1, the conclusion is true

I hope we can all be well?

I hope we will be find.

How much is 72 cents

72 points = 0.72 yuan

On the second power of the equation x + 2x = 3, this equation has a positive root and a negative root, right?

Yes, we don't need to find two. The sum of two is negative number - 2, and the product of two is positive number - 3. We can judge one positive and one negative

Fill in the blanks with proper forms of English words
Word given: damage; effect
1.The south of the country was worst __ by the drought.
2.Smoking seriously your health.
Why the first one uses effects and the second one uses images

The correct answer is as follows: 1) damage 2) effects / affected 2. Explanation: 1) damage refers to "damage / damage to objects", generally refers to the damage caused by natural disasters to places / roads / bridges, which can be repaired

SN is the sum of the first n terms of the arithmetic sequence. Given S6 = 36, Sn = 324, sn-6 = 144, then the value of n is?
This problem is too large, is there any simple? Did not write out the steps in detail. Forget

S6 = (a1 + A6) * 6 / 2 = 36, then a1 + A6 = 12 is expressed as 1
SN-S (n-6) = [a (N-5) + an] * 6 / 2 = 324-144 = 180, then a (N-5) + an = 60 is denoted as 2
And A6 + a (N-5) = a1 + an is denoted as 3
1. 2. By adding the two formulas and combining the three formulas, a1 + an = (12 + 60) / 2 = 36 is obtained
Sn = (a1 + an) * n / 2 = 324, so n = 324 * 2 / 36 = 18

Let X3 power y square + sin (XY) = x find the formula of DZ DZ. What I know is to push down almost,

x^3*y^2+sin(xy)=x
DZ?
Is there Z in the expression?
There seems to be a problem with the title, which is hard to answer

7 out of 11 minus 7 out of 11 multiplied by 7 out of 8

Extract 7 / 11 of the common factor, that is, 7 / 11 times 1 / 8 to get the solution

Tube formula 3.14/4 * (outer circle diameter square inner circle diameter Square) * length, the solution formula is to calculate what the tube, meaning

3.14/4 * (outer circle diameter square inner circle diameter Square) * length
=3.14 * (outer circle radius square inner circle radius Square) * length
=3.14 * outer circle radius square * length - 3.14 * inner circle radius square * length
=The volume of the cylinder filled with something in the middle - the volume of the middle gap
=Tube volume

For a function of two variables, the partial derivative exists, but it cannot be divided. Does this exist?
How can there be such a situation? Don't differential and derivative mean the same thing?

The partial derivative can only approach along the direction of the coordinate axis, while the differential can approach along two directions

In the sequence {an}, A1 = 1, a (n + 1) = C * an + [n + 1 power of C * (2n + 1)], where the real number C is not equal to 0, then the general formula of an is?