一、设矩阵A满足A2+A-4E=0,其中E为单位矩阵,则(A-E)-1=

Worksheet 1 Name Find out the words/expressions from the two conversations to fill in the following blanks. People who work in a company: business that has a manager and other people working there: A university or a government usually has several branches that are called

1 Definition Subordination means putting a grammatical unit in a lower rank or position. A grammatical unit that functions as a constituent of another unit of equal or lower rank of structure is called subordinate constructi, which might

Anything that can be offered to a market for attention, acquisition, use or consumption. Satisfies a want or a need. Includes: –Physical Products –Services –Persons –Places

Appendix B Useful identities Algebraic identities for vectors and dyadics A + B = B + A (B.1) A · B = B · A (B.2)

Content 1. summary of last article 2. exchange writing activity 3. a brief introduction of types of essays 4. Writing Is a process 5. writing is a social act 6.Task: write a story about yourself to your classmates

2-6解:a(o)s|(o) (/o) OPC 令a(a_1 代入上式,解方程得 ±a+√2+4a2Q

#include void maino printf(\l---a=%d, x=%f\\n\, a, x); X 将a的值赋给b后,a自加1*/

1.某温度时,NH4C(s)分解压力是标准压力,则分解反应的平衡常数K为: C(A)1(B)1/2(C)1/4(D)1/8

一、齐次线性方程组 例1设A为n阶矩阵,证明 R(A)=R(). 证明由于若Ax=0,有AAx=0,这说明凡是 Ax=0的解必为AAx=0的解。 另一方面,若AAx=0,我们记Ax=y,则有 yy=x'a'ax=x(a'Ax)=0,则y=0,亦 即Ax=0.这说明凡是AAx=0的解必为Ax=0的 解。故A'Ax=0与Ax=0的同解。当两齐次线性 方程组同解,意味着它们的基础解系包含的向 量个数相等,亦即有: n-R(A)=n-R(A'A) 所以R(A)=R(A'a)