07-08线性代数A试卷答案
啊
河北科技大学2007——2008 学年第一学期
《 线性代数》试卷（A）答案及评分标准
学院 电气 班级 电气061—3,测控061
一． 单项选择题：（每题3分，共18分）
1．C 2．B 3．D 4．C 5．D 二． 填空题（每题3分，共18分）
1．1 2．
2 1
7 3
6．C
3．2 4．1 5．1 6．1
三． 计算题（每题10分，共30分） 1．解一 按第一行展开，
1
240
130
2
4 ······································································ 5分 0
原式 3
0 204
3
4 ······································································································· 5分
1
0130
0240
000 2
003
解二 原式 ················································································· 3分
120
0 ······················································································ 4分 2
34
4 ····································································································· 3分
1 5 0 0
07 3
0 2 ··········································································· 41
2．解一 因为A 1分
所以
1 5 1
X AB 0
0
07 3
0 10 2 01 1
20 2 1
······································································· 2分
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