Given that f (x) is a quadratic function and f (0) = 0, f (x + 1) = f (x) + X + 1, find f (x)

Given that f (x) is a quadratic function and f (0) = 0, f (x + 1) = f (x) + X + 1, find f (x)

When to omit the multiplier
AB can be omitted, but 1 * 2 can't be omitted. Is there a multiplication sign between a and 1, such as a * 1 or A1

Generally, the number is written in the front. If the number is 1, it is not written,
For example, a * 1 is written as a
For example, a * 2 is written as 2A

If the solution set of equation AX's square + 5x + C = 0 is {1 / 2,1 / 3}, what is a equal to
Online, etc

-5/a=(1/2)+（1/3）=5/6,a=-6
c/a=(1/2)*(1/3)=1/6
c=6a=-36

How to use Excel to calculate linear regression equation?

Click Tools - add in - Analysis Database
Tools -- data analysis -- regression, just enter y and X values

Ask a question about definite integral
∫ (lower limit 0, upper limit 1) x2tanxdx=
Please give detailed explanation, thank you (┬)
It's x squared TaNx

The original formula is ∫ (0-- > 1) tanxd (x ^ 3 / 3) = x ^ 3tanx / 3 [0-- > 1] - 1 / 3 * ∫ (0-- > 1) [x ^ 3 / 1 + x ^ 2] DX
=1 / 3-1 / 12 * ∫ (0-- > 1) d (x ^ 4) / 1 + x ^ 2 = 1 / 3-1 / 12 * ∫ (0-- > 1) 2tdt / 1 + T (let t = x ^ 2)
So the result is 1 / 3 - (1-ln2) / 6

1. How to cut a plastic pipe with a length of 150cm and a rectangular shelf with three sides of 12cm, 10cm and 8cm respectively,
2. It is known that the edge length of cuboid carton without cover is 4cm.6cm and 8cm respectively. What is the outer surface and volume of the carton?
3. Cut a 32m long wooden strip to form a cuboid shelf. The length, width and height of the cuboid are all integral meters and cannot be equal. Calculate the cuboid volume

1. After cutting 4 48CM, 4 10cm, 4 8cm, the volume is 30cm.2; 4 * 6 * 8 = 192, surface area: 2 * (4 * 6 + 4 * 8) + 6 * 8 = 160 or 2 (4 * 8 + 8 * 6) + 4 * 6 = 164 or 2 (6 * 8 + 6 * 4) + 4 * 8 = 1763, there are two possibilities: possibility 1: because 32 = (1 + 2 + 5) × 4, the length and width of this cuboid

It is known that a (4,0) and B (2,2) are the points in the ellipse X225 + Y29 = 1, and M is the moving point on the ellipse, then the maximum value of | Ma | + | MB | is______ ; the minimum value is______ ．

A is the right focus of the ellipse, and the left focus is f (- 4,0), B is in the ellipse, then the definition of the ellipse is defined by the ellipse definition | | +