作者heng31029 (俺是耕田的)
看板NTU-Exam
标题[试题] 108-1 萧浩明 工程数学 期末考
时间Sat Jan 18 19:22:31 2020
课程名称︰工程数学上
课程性质︰必修
课程教师︰萧浩明
开课学院：工学院
开课系所︰机械系
考试日期（年月日）︰2020/1/8
考试时限（分钟）：60分钟
是否需发放奖励金：是
试题 :
1. Find the recurrence formula for the power series solution around t = 0
for the nonhomogeneous differential equation y''+ ty = e^(t+1).
∞
Given that e^t = Σ (t^n/n!)
n=0
2. True or False?
(a) If Xis an eigenvector of A associated with eignevalue λ and
B = P^(-1)AP holds, then Y = PX is an eigenvector of B associated with
the same eigenvalue.
(b) Eigenvectors corresponding to different eigenvalues are not necessarily
linearly independent.
(c) det A^(T) = det A, provided A is a square matrix; det A^(-1) = det A,
provided A has an inverse.
(d) If A and B are nonsingular, then (AB)^(-1) = B^(-1)A^(-1) and
[A^(T)]^(-1) = [A^(-1)]^(T).
(e) If B is formed from a square matrix A by interchanging two rows or
two columns of A, then det A = -det B.
3. (a) Find a matrix B with eigenvalues λ1 = 1 and λ2 = 0, with their
corresponding eigenvectors x1 = [3,1]^(T) and x2 = [2,1]^(T).
(b) Calculate B^160.
┌ -3 1 ┐ ┌ 3t ┐
4. solve X' = │ │X + │ │ by Variation of Parameters.
└ 2 -4 ┘ └ e^(-t) ┘
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