Let a square matrix of order n satisfy the square of a - 5A + 7e = 0, prove that 3e-a is invertible, and find the inverse matrix of (3a-e)

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• 1. Difference of 201 202 304 stainless steel I want to know their uses, materials and prices,
• 2. If the square root of a + B + 1 and | A-B + 2 | are opposite to each other, find the cube of 22a-2b + 7 There should be a process
• 3. {7x of 5 + 7Y of 5 = 210 {7x of 5 × 0.8 + 7Y of 5 × 0.8}
• 4. 4X (3.4x) = 18.8, acute
• 5. How to solve the equation 6x + 4 = 8x-4,
• 6. There are four numbers in an equal ratio sequence. Subtract 1,1,4,13 from the four numbers to form an equal difference sequence. Then the four numbers are ()
• 7. In △ ABC, ab = AC, the perpendicular of AB intersects AC at F. if AB = 12cm and the perimeter of △ BCF is 20cm, then the perimeter of △ ABC is (process)
• 8. Given that the square matrix satisfies a ^ 2-2a + 2E = 0, it is proved that a and a-3e are invertible, and the inverse matrices of a and a-3e are obtained
• 9. What does stainless steel 304316304l or 306l mean?
• 10. The square root of 1.21 × 104
• 11. In the isosceles triangle ABC, ab = AC = 12cm, De is the vertical bisector of the waist AB, de intersects AB to D, BC to e, and BC = 20cm
• 12. There are four numbers in the equal ratio sequence. Subtract 1,1,4,13 from these four numbers respectively, and then they will become the equal difference sequence again. Find these four numbers
• 13. Let a square matrix of order n satisfy a ^ 2-3a + 3E = 0, prove that a-2e is invertible, and find its inverse matrix?
• 14. If a is a square matrix of order n and AAT = e, | a | = - 1, it is proved that | a + e | = 0, where e is the identity matrix
• 15. If a is a square matrix of order n and AAT = e, | a | = - 1, it is proved that | a + I | = 0, where I is the identity matrix
• 16. Let a be a square matrix of order n and satisfy a ^ 2-3a + 2E = 0, it is proved that the eigenvalue of a can only be 1 or 2
• 17. 4. Let the four eigenvalues of a square matrix of order 4 be 3,1,1,2, then | a|=
• 18. Let the three eigenvalues of a matrix of order 3 be - 1,2,4, then what are the three eigenvalues of a *?
• 19. Let 2 be an eigenvalue of a square matrix of order 3, then a ^ 2 must have an eigenvalue?
• 20. Let the three eigenvalues of a matrix of order 3 be 2, - 4,3, then the three eigenvalues of a * are () A 2,-4,3 B 1/2,-1/4,1/3 C -12,6,-8 D 12,-6,8