题目7A. 如果<img src="https://tihai-oss-cloud.itihey.com/img/5b8063ce4307a42d73f40513a3f6f4e2.png">个向量<img src="https://tihai-oss-cloud.itihey.com/img/33daf899431b218434c86cfc52ab3cde.png">线性无关,则加入<img src="https://tihai-oss-cloud.itihey.com/img/69ae27cdc4162ffd91a6adcaf18ed10d.png">个向量<img src="https://tihai-oss-cloud.itihey.com/img/4cf41092033fca20a133069f4515a98b.png">后,仍然线性无关B. 如果<img src="https://tihai-oss-cloud.itihey.com/img/5b8063ce4307a42d73f40513a3f6f4e2.png">个向量<img src="https://tihai-oss-cloud.itihey.com/img/33daf899431b218434c86cfc52ab3cde.png">线性无关,则在每个向量中增加<img src="https://tihai-oss-cloud.itihey.com/img/69ae27cdc4162ffd91a6adcaf18ed10d.png">个分量后所得向量组仍然线性无关C. 如果<img src="https://tihai-oss-cloud.itihey.com/img/5b8063ce4307a42d73f40513a3f6f4e2.png">个向量<img src="https://tihai-oss-cloud.itihey.com/img/33daf899431b218434c86cfc52ab3cde.png">线性相关,则加入<img src="https://tihai-oss-cloud.itihey.com/img/69ae27cdc4162ffd91a6adcaf18ed10d.png">个向量后,仍然线性相关D. 如果<img src="https://tihai-oss-cloud.itihey.com/img/5b8063ce4307a42d73f40513a3f6f4e2.png">个向量<img src="https://tihai-oss-cloud.itihey.com/img/33daf899431b218434c86cfc52ab3cde.png">线性相关,则在每个向量中去掉<img src="https://tihai-oss-cloud.itihey.com/img/69ae27cdc4162ffd91a6adcaf18ed10d.png">个分量后所得向量组仍然线性相关