设向量组线性无关, 则下列向量组线性无关的是_____.532d047fa08e3b2ca97fc45f89897273.png

A . β必可用α1，α2线性表示 B . α1必可用α2，α3，β线性表示 C . α1，α2，α3必线性无关 D . α1，α2，α3必线性相关

没向量组(I)：a1，a2，…，an(Ⅱ)：a1，a2，…，an-1则必有()． A．向量组(Ⅱ)线性无关则向量组(I)线性尤关 B．向量组(I)线性相关则向量组(Ⅱ)线性相关 C．秩(I)=秩(Ⅱ)，则向量组(I)线性相关 D．秩(I)=秩(Ⅱ)，则向量组(Ⅱ)线性无关

A.<img src='https://img2.soutiyun.com/ask/2021-03-04/983720893957208.png' /> B.<img src='https://img2.soutiyun.com/ask/2021-03-04/983720900590587.png' /> C.<img src='https://img2.soutiyun.com/ask/2021-03-04/983720906678935.png' /> D.<img src='https://img2.soutiyun.com/ask/2021-03-04/983720913180307.png' />

已知向量组<img src='https://img2.soutiyun.com/ask/2020-08-14/966262269756101.png' />线性无关，则向量组(). A.<img src='https://img2.soutiyun.com/ask/2020-08-14/9662622959716.png' />线性无关 B.<img src='https://img2.soutiyun.com/ask/2020-08-14/966262306211186.png' />线性无关 C.<img src='https://img2.soutiyun.com/ask/2020-08-14/966262314274647.png' />线性无关 D.<img src='https://img2.soutiyun.com/ask/2020-08-14/966262323047149.png' />线性无关

已知向量组<img src='https://img2.soutiyun.com/ask/2021-03-04/983724832993508.png' /> 则下列向量组中不是向量组<img src='https://img2.soutiyun.com/ask/2021-03-04/983724841928018.png' />的极大线性无关组的是()。 A.<img src='https://img2.soutiyun.com/ask/2021-03-04/983724858335957.png' /> B.<img src='https://img2.soutiyun.com/ask/2021-03-04/983724864733323.png' /> C.<img src='https://img2.soutiyun.com/ask/2021-03-04/98372486976161.png' /> D.<img src='https://img2.soutiyun.com/ask/2021-03-04/983724875675949.png' />

设向量组<img src='https://img2.soutiyun.com/ask/2021-03-04/983724183602365.png' />线性无关。则参数t满足____

设<img src='https://img2.soutiyun.com/ask/2021-02-26/983188706325689.jpg' />证明三直线 <img src='https://img2.soutiyun.com/ask/2021-02-26/983188723875693.png' /> 相交于一点的充要条件为向量组a，b线性无关，且向量组a，b，c线性相关。

是 否

A.在齐次线性方程组AX=0中，R(A)＜未知数的个数m+1,所以AX=0有非零解，即存在非全零的常数k1,k2,....,km+1使得：k1a1+k2a2+....+km+1am+1=0,所以向量组A线性相关。B.向量组A中一定会有零向量。C.m+1个m维向量中一定有两个向量相等。D.R(A)＜m

A．β必可用α1，α2线性表示 B．α<sub>1必可用α<sub>2，α<sub>3，β线性表示 C．α<sub>1，α<sub>2，α<sub>3必线性无关 D．α<sub>1，α<sub>2，α<sub>3必线性相关

A．α1，α2，α1+α2 B．α1一α2，α2一α3，α2一α3 C．α1，α2，2α1一3α2 D．α2，2α3，2α2+α3

设向量组<img src='https://img2.soutiyun.com/ask/2020-08-14/966264529210334.png' />线性无关,<img src='https://img2.soutiyun.com/ask/2020-08-14/966264538560869.png' />证明向量组<img src='https://img2.soutiyun.com/ask/2020-08-14/966264553639732.png' />也线性无关.

设<img src='https://img2.soutiyun.com/ask/2020-07-27/964689131593775.png' />，证明三直线 相交于一点的充要条件为向量组a,β, y线性相关而向量组a. β线性无关。