【单选题】已知 a 1 , a 2 是齐次线性方组 AX = 0 的基础解系, b 1 , b 2 是非齐次线性方程 AX = b 的两个不同的解向量, k 1 , k 2 为任意常数 , 则 AX = b 的通解为( )。
A.
k 1 a 1 + k 2 a 2 + ( b 1 - b 2 )
B.
k 1 b 1 + k 2 b 2 + ( a 1 - a 2 )
C.
k 1 a 2 + k 2 ( a 1 + a 2 ) + ( b 1 + b 2 )
D.
k 1 a 1 + k 2 ( b 1 - b 2 ) + ( b 1 + b 2 )
【单选题】设α 1 ,α 2 是非齐次线性方程组 Ax=b 的解,又已知 k 1 α 1 +k 2 α 2 也是 Ax=b 的解,则 k 1 +k 2 =__________.
【简答题】Recently, professor of philosophy(哲学)in the United States has written a book called Money and the Meaning of Life. He has discovered that how we deal with money in our daily life has more meaning than...
【多选题】安全评价的主要目的是运用安全系统工程的原理和方法,识别和评价系统中存在的危险、有害因素。在进行安全评价时,通常要选用不同的安全评价方法。安全评价的方法很多,常用的分类方法有( )。
【单选题】已知4己非齐次线性方程组Ax=b的系数矩阵的秩等于3,且η 1 ,η 2 ,η 3 是3个不同的解向量,则通解是______.
B.
x=k 1 η 1 +k 2 η 2 +η 3
C.
x=k 1 η 1 +k 2 η 2 +k 3 η 3
【简答题】Writer Joseph Heller died of a _1__ __2_ when he was 76 years old. Joseph Heller was famous for writing a book called Catch-22. It was about life in the American __3_ during World War II. The book mad...
【简答题】Recently, a professor of philosophy in the United States has written a book called Money and the Meaning of Life.He has discovered that how we deal with money in our day-to-day life has more meaning t...
【简答题】Recently a professor of philosophy(哲学)in the United States has written a book called Money and the Meaning of Life. He has discovered that how we deal with money in our day to day life has more meanin...