作者t0444564 (艾利欧)
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标题[试题] 98下 翁秉仁 线性代数二 第一次小考
时间Mon May 6 02:41:17 2013
课程名称︰线性代数二
课程性质︰数学系大一必修
课程教师︰翁秉仁
开课学院:理学院
开课系所︰数学系
考试日期︰2010年03月12日(五),11:20-12:10
考试时限:60分钟
是否需发放奖励金:是
试题 :
线性代数小考 2010/03/12
┌ -1 1 -1 ┐
1. [30%] A = │ -1 1 0 │. Find all eignevalues and the corresponding
└ 0 0 1 ┘
eigenspaces of A.
2. [30%] Suppose u and v are two non-zero vectors in |R^n, we define the n ×n
square matrix A by
A = u . v^T
a. Find all eigenvalues and the corresponding eigenspaces of A.[20%]
b. Could we always find an eigenbasis for A?[10%]
3. [40%] Let P2 be the vetor space of polynomials whose degree are ≦2 and M2
be the vector space of 2 by 2 square matrices. A = ┌ 1 1 ┐. We define the map
└ 1 0 ┘
T : P2 → M2 by T(at^2 + bt +c) = aA^2 + bA + cI.
a. Prove that T is a linear transformation.[8%]
b. Let 1,t,t^2 be a basis of P2; and ┌ 1 0 ┐,┌ 0 1 ┐,┌ 0 0 ┐,
└ 0 0 ┘ └ 0 0 ┘ └ 1 0 ┘
┌ 0 0 ┐ be a basis of M2. Find the correspnding matrix [T] of T w.r.t
└ 0 1 ┘
these bases. [8%]
c. Describe the ker T. [8%]
d. Describe the im T. [8%]
e. Does A^5 ∈im T? [8%]
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