【多选题】【消耗次数：1】
关于初等矩阵的逆矩阵，下列说法正确的是
①
初等矩阵都可逆，但它们的逆矩阵未必都是初等矩阵。
②
<img src=https://huaweicloudobs.ahjxjy.cn/65CF9C9222D0277DB03C23BA527B195B.png title=5.png alt=5.png/>
③
<img src=https://huaweicloudobs.ahjxjy.cn/7C3ECF59AB32EE5212B4200818702D0E.png title=6.png alt=6.png/>
④
<img src=https://huaweicloudobs.ahjxjy.cn/426EB1B3181CA71FCBC747D266B6538E.png title=7.png alt=7.png/>
参考答案：
复制
纠错
相关题目
【单选题】
<img src=https://huaweicloudobs.ahjxjy.cn/FD81B5A484C2B1E4297338DA0C6C50D9.png title=7.png alt=7.png/>
①
<img src=https://huaweicloudobs.ahjxjy.cn/A01AD9ED64F117895882D4DC16651DAA.png title=7-1.png alt=7-1.png/>
②
<img src=https://huaweicloudobs.ahjxjy.cn/62F694E2D2855C3AF4EF47B968258F56.png title=7-2.png alt=7-2.png/>
③
<img src=https://huaweicloudobs.ahjxjy.cn/63FA91CA02E0D388EFB1701804EE8A66.png title=7-3.png alt=7-3.png/>
④
<img src=https://huaweicloudobs.ahjxjy.cn/72F8BCACDE6C4B23C7ED3977BA5E8733.png title=7-4.png alt=7-4.png/>
【单选题】
<img src=https://huaweicloudobs.ahjxjy.cn/1605B165AF7E14EB048065D48555C4B6.png title=5.png alt=5.png/>
①
<img src=https://huaweicloudobs.ahjxjy.cn/FFD9D910ACA77B53F170E7059AEB2EF3.png title=5-1.png alt=5-1.png/>
②
<img src=https://huaweicloudobs.ahjxjy.cn/B25211B2E860233F7CE77DDCF7EA8273.png title=5-2.png alt=5-2.png/>
③
<img src=https://huaweicloudobs.ahjxjy.cn/A8C5EEA2167AF1DD451BD6827854E574.png title=5-3.png alt=5-3.png/>
④
<img src=https://huaweicloudobs.ahjxjy.cn/4343D127072A6B7BB118576B0B541CDE.png title=5-4.png alt=5-4.png/>
【简答题】
<img src="https://huaweicloudobs.ahjxjy.cn/7D4AEBB90BC006A22EE6EBEB553748C5.png" title="5.png" alt="5.png"/><img src="https://huaweicloudobs.ahjxjy.cn/D1368CFD26378C41B48B70EB0167B92F.png" title="6.png" alt="6.png"/>[填空1]，<img src="https://huaweicloudobs.ahjxjy.cn/4082DCA8290A99E9AA41AE3C7E2DA1FF.png" title="7.png" alt="7.png"/>[填空2]。
【多选题】
<img src=https://huaweicloudobs.ahjxjy.cn/631A67ABC7C0AA0DB0C7B9BEE9A1849E.png title=5.png alt=5.png/><img src=https://huaweicloudobs.ahjxjy.cn/EC8583C8AA766F69070257512104A8D4.png title=6.png alt=6.png/>则下面计算结果正确的是
①
<img class=jc-formula data-tex=a=\frac { 1 }{ 3 } src=https://huaweicloudobs.ahjxjy.cn/A4FC0D089B3E34A4C9C765EFDCB415BC.png style=vertical-align: middle;/>
②
<img class=jc-formula data-tex=a=-\frac { 2 }{ 3 } src=https://huaweicloudobs.ahjxjy.cn/4B2120C41DECCC8AFE70663918986066.png style=vertical-align: middle;/>
③
<img class=jc-formula data-tex=b=0 src=https://huaweicloudobs.ahjxjy.cn/9A81261EDFE166EEDF6D639A4EE5E39C.png style=vertical-align: middle;/>
④
<img class=jc-formula data-tex=c=-\frac { 2 }{ 3 } src=https://huaweicloudobs.ahjxjy.cn/F7BE9659ED2B1AE2CF628D7EF81508DB.png style=vertical-align: middle;/>
【单选题】
<img src=https://huaweicloudobs.ahjxjy.cn/5F1F3A5E288C2DF0D6957B19B8077CDC.png title=7.png alt=7.png/>
①
<img src=https://huaweicloudobs.ahjxjy.cn/135A3D7E0A552830EE41960893992FE0.png title=7-1.png alt=7-1.png/>
②
<img src=https://huaweicloudobs.ahjxjy.cn/7275549704CE435B8368C8E3AE7C8F77.png title=7-2.png alt=7-2.png/>
③
<img src=https://huaweicloudobs.ahjxjy.cn/D19D1832E91899259236D762EA356DC5.png title=7-3.png alt=7-3.png/>
④
<img src=https://huaweicloudobs.ahjxjy.cn/F87A50E87EAAE842C3C36B842B83329C.png title=7-4.png alt=7-4.png/>
【判断题】
<img src=https://huaweicloudobs.ahjxjy.cn/88CD5D10076541703D7C1AC0BBA28CF3.png title=6.png alt=6.png/><img src=https://huaweicloudobs.ahjxjy.cn/1C2A4016514C2C1F7D3200137305BEC6.png title=7.png alt=7.png/>
①
正确
②
错误
【单选题】
<img src=https://huaweicloudobs.ahjxjy.cn/F70B5E6EF7858571F8FC3C4C8D006852.png title=7.png alt=7.png/>
①
<img src=https://huaweicloudobs.ahjxjy.cn/FAFF1284C76D6D67D8A6541DDF808276.png title=7-1.png alt=7-1.png/>
②
<img src=https://huaweicloudobs.ahjxjy.cn/03AA71A09C342B56453F8157D51BFFDA.png title=7-2.png alt=7-2.png/>
③
<img src=https://huaweicloudobs.ahjxjy.cn/10E9A0C3809C0B875299F3823EA70186.png title=7-3.png alt=7-3.png/>
④
<img src=https://huaweicloudobs.ahjxjy.cn/10F2B358614D55FBF3860DB033021A97.png title=7-4.png alt=7-4.png/>
【多选题】
<img src=https://huaweicloudobs.ahjxjy.cn/4D5521BCE006BBBAE834384DADF96091.png title=4.png alt=4.png/><img src=https://huaweicloudobs.ahjxjy.cn/799E99B7DB75195CAD99E4EF4B2A19F0.png title=5.png alt=5.png/><img src=https://huaweicloudobs.ahjxjy.cn/6668CDF06F182778DCCC9EC63F32E8B4.png title=6.png alt=6.png/>,下列表述正确的是
①
<img src=https://huaweicloudobs.ahjxjy.cn/D195ABE3F114C8923C2FF243B91B95D9.png title=7.png alt=7.png/>
②
<img src=https://huaweicloudobs.ahjxjy.cn/C78C68FAF288F7E8A9D9778AC90CE5DA.png title=8.png alt=8.png/>
③
<img src=https://huaweicloudobs.ahjxjy.cn/3F7B2210DC17A1BE97CC498E894146DE.png title=9.png alt=9.png/>
④
<img src=https://huaweicloudobs.ahjxjy.cn/E8C41008391518AB353BE781F11BDB6A.png title=10.png alt=10.png/>
【单选题】
<img src=https://huaweicloudobs.ahjxjy.cn/27483DB2B2FC1AAF40C45FF5B4A0D349.png title=7.png alt=7.png/>
①
<img src=https://huaweicloudobs.ahjxjy.cn/D594462BB5C4164FDFA0944CF623912C.png title=7-1.png alt=7-1.png/>
②
<img src=https://huaweicloudobs.ahjxjy.cn/FA4E04E7F344C8C36FF15B9BBC2795DF.png title=7-2.png alt=7-2.png/>
③
<img src=https://huaweicloudobs.ahjxjy.cn/ACF5C3328C49AA7DD6C0153DB71457B2.png title=7-3.png alt=7-3.png/>
④
<img src=https://huaweicloudobs.ahjxjy.cn/1B1EC4FA0924D60EA21B1C16BB9C9BF1.png title=7-4.png alt=7-4.png/>
【单选题】
<img src=https://huaweicloudobs.ahjxjy.cn/4B930D57827F5A7F93C085282B5A04C2.png title=5.png alt=5.png/>
①
<img src=https://huaweicloudobs.ahjxjy.cn/48D6719B7734A93DE6292129338A3CA5.png title=5-1.png alt=5-1.png/>
②
<img src=https://huaweicloudobs.ahjxjy.cn/48AA6D7BB818C7DC17C07294D2419DB0.png title=5-2.png alt=5-2.png/>
③
<img src=https://huaweicloudobs.ahjxjy.cn/6B7E4A2E27FEBFF63468755E016B2A66.png title=5-3.png alt=5-3.png/>
④
<img src=https://huaweicloudobs.ahjxjy.cn/20C2EA782ED82AA925442EB081194764.png title=5-4.png alt=5-4.png/>
【简答题】
<img src="https://huaweicloudobs.ahjxjy.cn/0B58517CA24006A5B0B05CE00A386782.png" title="5.png" alt="5.png"/><img src="https://huaweicloudobs.ahjxjy.cn/F46D2A2ADF5A2F30279E2B17345E9A5D.png" title="6.png" alt="6.png"/>[填空1]
随机题目
【单选题】
The rescue team must have searched for the missing visitors
two days ago, _____?
①
mustn’ t they
②
haven’ t they
③
didn’ t they
④
hadn’ t they
【单选题】
____ is announced in the papers, our country has
launched a large scale movement against smuggling and fraudulent activities in foreign currency exchange deals.
①
What
②
As
③
Which
④
That
【单选题】
The ____ crown jewels are kept in the Tower of London.
①
valued
②
valueless
③
invaluable
④
usable
【单选题】
Though ____ rich, she was better off than at any other period in her life.
①
by means of
②
within her means
③
by all means
④
by no means
【单选题】
You ____ that letter to James. However, you didn’t.
①
ought to write
②
ought to have written
③
should write
④
should be writing
【单选题】
She found herself____ forward more eagerly to the holiday
at home.
①
looking
②
bringing
③
desiring
④
expecting
【单选题】
When Sarah and I ____ on an article for the school newspaper, we found it difficult to work together.
①
compiled
②
gathered
③
collaborated
④
collected
【单选题】
____ for a long time, the fields are all dried up.
①
There has been no rain
②
Having no rain
③
There having been no rain
④
There being no rain
【单选题】
Then Johnny reached quickly ______ the other pot, vigorously boiling on the stove.
①
down
②
out
③
for
④
to