()) 1\uf02d(\uf02b⑵ 2. n阶行列式的性质:性质1 行列式转置后, 其值不变。 即 DT=D 。性质2 对换行列式的两行(列) 的位置, 则行列式的值变号 。性质3 将行列式的某性质3 将行列式的某一行(列) 的每个元素都乘以同一数k, 等于用数k乘这个行列式。行(列) 的每个元素性质4 如果行列式D中的某一行(列) 的每个元素都是两个数之和, 则此行列式等于两个行列式D1与D2之和。 性质5 将行列式的某一行(列) 的各元素乘以同一数k之后, 加到另一行(列) 对应位置的元素上去, 行列式的值不变 。3. 行列式按某一行(列) 的展开\uf0ed\uf0ec\uf03d\uf0e5\uf03dj01\uf0ee4.克莱姆法则\uf0ee\uf0ee\uf0ed\uf0ec\uf0b9\uf03d\uf03d\uf0ee\uf0b9\uf03d\uf0e5\uf03dtjtjDAasisiDAaitnijsjnij01且线性方程组当其系数行列式D不为零时, 有且仅有唯一解Dxj\uf03d),, 2 , 1(njDj\uf04c\uf03d 行列式的计算方法:(1) 化三角形行列式法。(2) 降阶展开法线性方程组的求法:利用克莱姆法则求解 nnnnnnnnnnn\uf04c\uf04d\uf04d\uf04d\uf04f\uf04d\uf04d\uf04c\uf04c\uf04c11113331223112311\uf02dn\uf02dn\uf02dn\uf02dn\uf02d\uf02d\uf02d计算:)(n\uf04c 111) 2 (121121121nnnaxaaaaxaaaax\uf04d\uf04d\uf04f\uf04d\uf04d\uf04d\uf04c\uf04c\uf04c\uf02d\uf02d\uf02d11321321n aaaaxaaa\uf04c\uf04c \uf0e5\uf03di1\uf02d\uf03d\uf02dx\uf02dx\uf03dnininxaxD000000100001) 3 (\uf04d\uf04d\uf04f\uf04d\uf04d\uf04d\uf04c\uf04c\uf04c证明:\uf02d\uf02d\uf02dannnaaaax12211000\uf04c\uf04c n\uf04c\uf04d\uf04f\uf04d\uf04d\uf04d\uf04c\uf04c\uf04c222232222222221) 4 (有唯一解, 并求解。=? 时方程组当\uf0ef\uf0ee\uf0ef\uf0ed\uf0ec\uf06c\uf03d\uf02b\uf02b\uf03d\uf02b\uf02b\uf03d\uf02b\uf02b\uf06c23213213211) 5 (\uf06c\uf06c\uf06c\uf06cxxxxxxxxx 今天作业:26 28(6)31 3132 #y%pUfL6B)sXjO9F0v!mRdI3z&pVgL7C)tYjPaF1w!nSdJ4z*qVhM7D-tZkPbG1x$nTeJ5 A*rWhN8D+uZlQbH2x%oTfK5B(rXiN9E+v#lRc H3y&pUgL6C)sYjOa F0w!mSdI4z&qVgM7C-tYkPaG1w$nSeJ4A*qWhM8D-uZ kQbG2x$oTe K5A(rWiN8E +u#lQc H2y%oUfK6B(sXiO9E0v#mRcI3y&pUgL6C)sYjOaF0w!mSdI4z*qVhM7D-tZkPbG1x$nTeJ5 A*rWhN8D+uZlQbH2x%oTfK5B(rXiN9E+v#lRc H3y%pUfL6B) sXjO9F0v!mRdI3z&pVgL7C)tYjPaF1w!nSdJ4z*qVhM7D -tZkPbG1x$nTeJ5A*rWiN8E+u#lQcH2y%oUfK6B(sXiO9E0v#mRcI3y&pUgL6C)sYjOaF0w!mSdI4z&qVgM7C-tYkPaG1w$nSeJ4A*qWhM8D-uZkQbG2x$oTeK5A(rW iN8E+ u#lQcH2y%oUfK6B(sXjO9F0v!mRdI3 z&pVgL7C)tYjPaF1w!nSdJ4z*qVhM7D -tZkPbG1x$nTeJ5A*rWhN8D+uZlQbH2x%oTfK5B(rXiN9E+v#lRcH3y%pUfL6B)sXjO9F0v!mRdI3z&pVgL7C)tYjPaG1w$nSeJ4A*qWhM8D- uZkQbG2x$oTeK5A(rWiN8 E+u#lQcH2y%oUfK6B(sXiO9E0v#mRcI3y&pUgL6C)sYjOaF0w!mSdI4z&qVgM7C-tYkPaG1w$nSeJ4A*qWhM8D-uZkQbH2x%oTfK5B(rXiN9E+ v#lRcH3y%pUfL6B)sXjO9F0v!mRdI3 z&pVgL7C)tYjPaF1w!nSdJ4z*qVhM7D-tZkPbG1x$nTe J5A*rWhN8D +uZlQbH2x% oTfK5 B(rXiN9E+v#lRcH3y&pUgL6C)sYj OaF0w!mSdI4z&qVgM7C-tYkPaG1w$nSeJ4A*qWhM8D-uZ kQbG2x$oTeK5A(rWiN8E+u#lQcH2y%oUfK6B(sXiO9E0v#mRcI3y&pUgL6C)sYjOaF0w!mSdI4z*qVhM7D-tZkPbG1x$nTe J5A*rWhN8D +uZlQbH2x% oTfK5 B(rXiN9E+v#lRcH3y%pUfL6B)sXjO9F0v!mRdI3 z&pVgL7C)tYjPaF1w! 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