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What do | a | and a * mean in linear algebraic matrix? 1 2 3 2 2 1 3 4 3 Find the inverse of this matrix |A| = 2 A* = 2 6 -4 -3 -6 5 2 2 -2 So a ^ - 1 = a * / |a |= 1 3 -2 -3/2 -3 5/2 1 1 -1
|A | is the determinant of a, also known as deta. A * refers to the adjoint matrix of matrix A, which is the matrix of the same level composed of the algebraic cofactors of the elements of a in the order of exchanging row and column marks
Definition and application of row ladder matrix
Please give me a specific definition. I want to know, for example
2 3 4 5
0 1 2 3
0 0 0 0
0 0 2 0
and
2 3 4 5
0 1 2 3
0 0 0 1
0 0 2 0
No more simplification
Is it a row ladder matrix?
What is the rank of each?
Please use simple language. I'm going crazy
Not counting, the first non-zero number of each line should be changed to 1, and it can be seen intuitively that this is not a ladder line at all. You always have to change the position of the third and fourth lines first
The first rank is 3 and the second is 4
Definition of row ladder matrix
Not counting, the first non-zero number of each line should be changed to 1, and it can be seen intuitively that this is not a ladder line at all. You always have to change the position of the third and fourth lines first
The first rank is 3 and the second is 4
Matrix multiplication problem
1 2 3 5
What is 3 1 times 6 7
Let 12 = a, 35 = B, ab = C = (CIJ), 31167, then C11 = the sum of the products of the first row of a and the corresponding elements of the first column of B, that is, 1 × 3 + 2 × 6 = 15, C12 = the sum of the products of the first row of a and the corresponding elements of the second column of B, that is, 1 × 5 + 2 × 7 = 19 Suppose a is a matrix of n × m, B is a matrix of M × P, C = AB is a matrix of n
Given that LGA and LGB are the two roots of equation 2x ^ 2-4x-1, find the value of LG ^ 2A / b
It is known that LGA + LGB = 4 / 2 = 2, LGA * LGB = - 1 / 2,
So [LG (A / b)] ^ 2 = (LGA LGB) ^ 2 = (LGA + LGB) ^ 2-4lga * LGB = 2 ^ 2-4 * (- 1 / 2) = 6
In every quadrant where the image of inverse scale function y = - 3 / X is located, the value of function y decreases with the increase of independent variable x__________ When 1 ＜ x ＜ 3, the value range of Y is
In every quadrant where the image of inverse scale function y = - 3 / X is located, the value of function y decreases with the increase of independent variable x_ Increase_ When 1 < x < 3, the value range of Y is (- 3, - 1)
The number a is 26.8, which is 2.6 less than 3 times of the number B. what is the product of the two numbers
Number B × 3-2.6 = number a
Number b = (number a + 2.6) △ 3 = 9.8
Number B × number a = 9.8 × 26.8 = 262.64
The standard equation of ellipse passing through point (2, - 3) and having common focus with ellipse 9x2 + 4y2 = 36 is?
emergency
9x2+4y2=36
x^2/4+y^2/9=1
c^2=9-4=5,c=√5
The focus is on the y-axis
Let the standard equation of ellipse be: x ^ 2 / b ^ 2 + y ^ 2 / A ^ 2 = 1
Then:
4/b^2+9/a^2=1
a^2-b^2=c^2=5
The results are as follows
a^2=15,b^2=10
Therefore, the standard equation of ellipse is: x ^ 2 / 10 + y ^ 2 / 15 = 1
After two fifths of the bicycles were sold, 360 bicycles were delivered. This is exactly two-thirds of the original number. How many bicycles were there
360/(2/3-3/5)=5400
Is cos - (A-2 π) equal to positive or negative?
cos-（a-2π）=cos（2π-a）=cosa
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