If matrix AB = 0, then the relation between matrix A and matrix B Determinant a = 0, B = 0,

Obviously wrong. If a and B are not square matrices, the determinant does not exist
If they are all square matrices, it only means that one of them is lack of rank

RELATED INFORMATIONS

1. It is known that 248-1 can be divided by some two integers between 60 and 70, then the two numbers are () A. 61，62B. 61，63C. 63，65D. 65，67
2. The constant term of polynomial 3x ^ 2-5y is The problem is that the coefficient of the first order term of the polynomial 3x ^ 2-5y is, and the constant term is
3. The circumference of an isosceles triangle is 70 cm. The ratio of the length of a waist to the length of its bottom is 3:4. How many cm is the bottom of the triangle?
4. How many days is 321 hours
5. 119 points 108 + 119 points 11 * 120 simple operation
6. When Xiao Ming solved the equation 2x − 15 + 1 = x + A2, due to carelessness, when the denominator is removed, the left 1 of the equation is not multiplied by 10, so the solution obtained is x = 4. Try to find the value of a, and correctly find the solution of the equation
7. Solve equation 4.6 times 3 divided by 0.7x = 29.9 It's urgent
8. Solve the equation 8x + 4 = 2 (4x + 3) - 2 (- 3 + x)
9. There are three numbers in an equal ratio sequence, and the sum is 21. If the third number subtracts 9, then the three numbers will become an equal difference sequence, and the three numbers can be calculated I figured out that the middle number was four,
10. It is known that the coordinates of vertex A and B of square ABCD are a (1,0), B (5,3) respectively, and point D is in the second quadrant
11. It is proved that (1) B + e is an invertible matrix (2) (B + e) ^ (- 1) = 1 / 2 (a + b)` The second question is (B + e) ^ (- 1) = 1 / 2 (a + e)
12. Given the relative vertices a (0, - 1) and C (2,5) of square ABCD, the coordinates of vertices B and D are obtained
13. There are four numbers, the first three numbers are equal proportion series, the last three numbers are equal difference series, the sum of the first and last two terms is 21, and the middle two terms If it is a / Q, a, AQ, a (2q-1), how to solve it,
14. The circumference of an isosceles triangle is 70 cm. The ratio of the length of a waist to the length of its bottom is 3:4. How many cm is the bottom of the triangle?
15. The length of one side of an isosceles triangle is 7, and the length of one side is 9
16. P7. It is known that if one side of an isosceles triangle is 6 and the other side is 10, its circumference is equal to ()
17. Given that the lengths of the two sides of an isosceles triangle are 5 and 10 respectively, the perimeter of the isosceles triangle is______ ．
18. Given that the length of one side of an isosceles triangle is equal to 5 and the length of the other side is equal to 11, find the perimeter of the isosceles triangle
19. The base length of isosceles triangle with perimeter 4 is x, and the waist length is y. find the value range of X Such as the title
20. If the circumference of an isosceles triangle is 12, the length of one waist is x, and the length of the bottom edge is y, then the value range of X is y, and the value range of Y is y