简答题:已知向量组<img src="http://www.weimei168.com/uploads/202208/161258009386721.png" width="20" height="29" />=(1，-1，1)，<img src="http://www.weimei168.com/uploads/202208/161258010087261.png" width="24" height="29" />=(0，<img src="http://www.weimei168.com/uploads/202208/161258031939401.png" width="17" height="19" />，2)，<img src="http://www.weimei168.com/uploads/202208/161258032591021.png" width="22" height="30" />=(1，2，<img src="http://www.weimei168.com/uploads/202208/161258033090361.png" width="17" height="19" />)， <br /> 求：(1)当口为何值时，<img src="http://www.weimei168.com/uploads/202208/161258033722851.png" width="70" height="30" />线性无关． <br /> (2)当a为何值时， <img src="http://www.weimei168.com/uploads/202208/161258041877861.png" width="70" height="30" />线性相关．