A <img src="https://www.beizhujiaoyu.com/uploads/202208/161267514069691.png" width="86" height="49" /> B <img src="https://www.beizhujiaoyu.com/uploads/202208/161267514689701.png" width="85" height="50" /> C <img src="https://www.beizhujiaoyu.com/uploads/202208/161267515198641.png" width="94" height="72" /> D <img src="https://www.beizhujiaoyu.com/uploads/202208/161267515533611.png" width="94" height="72" />

A <img src="https://www.beizhujiaoyu.com/uploads/202208/161267596443631.png" width="73" height="81" /> B <img src="https://www.beizhujiaoyu.com/uploads/202208/161267596931891.png" width="91" height="80" /> C <img src="https://www.beizhujiaoyu.com/uploads/202208/161267597642191.png" width="73" height="80" /> D <img src="https://www.beizhujiaoyu.com/uploads/202208/161267598115971.png" width="73" height="80" />

A 所有三阶子式都为零 B  所有二阶子式都不为零 C  存在一个三阶子式不为零 D  所有二阶子式都为零

A <img src="https://www.beizhujiaoyu.com/uploads/202208/161267600145891.png" width="47" height="53" /> B <img src="https://www.beizhujiaoyu.com/uploads/202208/16126760061371.png" width="64" height="52" /> C <img src="https://www.beizhujiaoyu.com/uploads/202208/161267601177541.png" width="82" height="54" /> D <img src="https://www.beizhujiaoyu.com/uploads/202208/161267601770741.png" width="82" height="54" />