（填空题）
__________
三阶行列式
的值为__________
有方程组
只有唯一解，求A的取值范围（ ）
有四阶行列式5THKX.png)
,求54QNWI.png)
的值__________
n阶行列式
的值__________
（填空题）
__________
题目
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正定矩阵
对于求正惯性指数的题目，首先要写出对应的矩阵，然后通过特征值方程求解特征值，特征值为正的个数为正惯性指数
多做几道
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该科目易错题
- It can be inferred from the passage that England is rarely hit by high magnitude earth.（）ATrueBFalseCNot Given
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- In Paragraph 5, the word"heavily"could best be replaced by which of the following?（）AWidelyBDenselyCChieflyDLargely
- Which of the following is NOT mentioned as a tree found in British Columbia?（）AHemlockB CedarC FirDPine
- What effect do the mountains have on winds?（）AMake them dry.BMake them wet.CMake them cool.D Make them weak.
- （）AissueBpassedCdebateDanotherE otherF internationalGrelatedH influenceIsawJprofessorKnationalLcomfortable
- （）AissueB passedCdebateDanotherEotherF internationalG relatedHinfluenceIsawJprofessorK nationalLcomfortable
- （）A issueBpassedC debateDanotherE otherFinternationalGrelatedHinfluenceIsawJprofessorKnationalLcomfortable
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