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Finding the sum of two matrices A + B product a * B
//
#include
void And(int a[][256],int b[][256],int n,int m)
{
int i,j;
Printf ("the sum of the two matrices is: n");
for (i=0;i
If AB = Ba, a matrix B is said to be commutative with A. let a = find all matrices commutative with a
If you want to know how to solve this kind of problem, as for what a is, first, I can't type it out, but what should I do if I change other numbers. Please help me
First of all, you need to know that two matrices are interchangeable, indicating that they are square matrices. So let the required matrix be of the same order as a
Then, according to ab = Ba, it is expressed by matrix multiplication
Finally, if the elements at the corresponding positions on the left and right sides are equal, the solution is obtained
I wonder if I have made it clear
If a matrix AB = Ba, then a and B are called what matrices
A. B must be a square matrix of the same order
It's called exchangeable
1 / 3 (9ab & # 178; - 3) + (7a & # 178; b-2) + 2 (AB & # 178; - 1) - 2A & # 178; b where (a + 2) &# 178; + ▏ B-3 ▏
process
(9ab \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\because (a + 2) &# 17
There is a Japanese character on the left and a military character on the right
The sun and the moon shine
Scientific questions
Drop a few drops of silver nitrate solution into a test tube filled with hydrochloric acid. What will you see?
Then drop a few drops of nitric acid into the test tube. After shaking, it is found that_______
I want to know why
First, white precipitate will appear in the test tube. After adding nitric acid, the precipitate will not disappear
This is because hydrochloric acid and silver nitrate ionize H + Cl - Ag + No3 + respectively, and the Cl - combines with Ag + to form precipitated silver chloride. However, silver chloride cannot be dissolved in nitric acid. Water gas and precipitate must be generated in the double decomposition reaction, and silver chloride and nitric acid will not react to form one of them, so there is no reaction
When x = - 2, then x = 2 is ax & # 179; + BX + 5 = - 9
The figure below is the plan of the swimming pool of Zhongshan primary school. If the swimming pool is 50 meters long and 30 meters wide, measure all the required data and find the scale of the map
Measured on the picture: the picture is a rectangle, that is, a swimming pool, 2.5 in length and 1.5 in width
50m=5000cm
Scale = 2.5/5000 = 1 / 2000
Interesting game composition, about 400 words
Interesting ················································································
An interesting thing, everyone's life, there will be many "stories", happy, sad, angry I remember when I was five years old, I just learned how to ride a bicycle (four-wheel bicycle). In order to show off to my friends, I often ride it in the community "
Given that the sum of squares of two consecutive odd numbers is equal to 74, find the two numbers
Can you answer that
X^2+(X+2)^2=74
2X^2+4X=70
X^2+2X-35=0
(X-5)(X+7)=0
X1=5,X2=-7
So the two numbers are 5 and 7
Or - 5, - 7
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