The multiplication of MATLAB polynomials is actually a convolution operation between polynomial coefficient vectors? What's the convolution operation between vectors? What's the convolution operation between polynomial functions? Does convolution operation between vectors have calculation formula? How to operate specifically?

It's essentially the same
Vector convolution and convolution between polynomial functions are the same in algorithm, so they are both conv functions
The coefficient of a polynomial function is actually a vector
Supplementary question:
Vector convolution is the convolution of discrete signals, read any "signals and systems" book can
Y (n) = ∑ x (m) H (n-m) (sum variable is m)

People's blood accounts for about one thirteenth of their body weight. How much water is contained in their blood? About two thirds of their blood is water. Xiaodong's weight is 39 kg
Q: how much water is in his blood?

39/13*2/3=2 kg

F (x) = x ^ (2 / 3) why does the derivative of F (x) not exist when x = 0?

f′（x）=2/3x^(-2/3)
Because the exponent is negative, that is, the reciprocal, X is the denominator and cannot be 0, and the reciprocal of - 0 is negative infinity, the reciprocal of + 0 is positive infinity, and the left and right limits at 0 are different, so the derivative of F (x) does not exist

X-3.6 = 12.5, the solution of the equation can be obtained by adding () on both sides of the equation

X-3.6 = 12.5, the solution of the equation can be obtained by adding (3.6) on both sides of the equation
x-3.6=12.5
x-3.6+3.6=12.5+3.6
x=16.1

The sewer is a pipe with an inner diameter of 1.6 meters. If the water flow rate is 2 meters per second, how many cubic meters of water can flow in an hour?

Volume per second = 3.14 * (1.6 / 2) ^ 2 * 2 = 4.0192 M3
Therefore, it can flow 4.0192 * 60 * 60 = 14469.12 cubic meters of water in one hour

According to the definition, it is proved that y = (x ^ x – 4) / (x + 2) is infinitesimal when x → 2

According to the definition, it is proved that y = (x ^ x – 4) / (x + 2) is infinitesimal when x → 2
Is "y = (X & # 178; – 4) / (x + 2) is infinitesimal when x → 2"

How about 6 △ 9 times 2 / 3 plus 2 / 3 times 98

9 / 107

A few days ago, I did a number reasoning problem: 1,7,7,9,17,43, () what number should be filled in the brackets? Why? Sorry, I forgot the option

7,7,9,17,43,( )
Do a bad job
After 0,2,8,26,80 plus 1, it was as follows:
1. 3, 9, 27, 81, etc
So the answer is 43 + 80 = 123

If the magnitude of three common point forces is F1 = 5N, F2 = 10N, F3 = 20n, then their resultant force ()
A. No more than 35nb. The minimum value is 5nc. It may be 0d. It may be 20n

The maximum of the three forces is equal to the sum of the three forces. That is 35n. The maximum resultant force of F1 and F2 is 15N, the minimum resultant force is 5N, F3 = 20n, so the minimum resultant force of the three forces is 5N. Therefore, the value range of resultant force F is 5N ≤ f ≤ 35n. Therefore, abd is selected

In the sequence {an}, A1 = 3, an + 1 = an ^ 2, then a general formula of {an} is

1. According to two known conditions, list the first few terms of this sequence as
a1=3=3^1
a2=3^2
a3=3^4
a4=3^8
a5=3^16
……
It is observed that every item is a power of 3, and its exponent is a power of 2. In the power of 2, the exponent is less than the number of items by 1
This is the general term formula

People's blood accounts for about one thirteenth of their body weight. How much water is contained in their blood? About two thirds of their blood is water. Xiaodong's weight is 39 kg Q: how much water is in his blood?