计算四阶行列式:D=
|1020|
|0102|
|3040|
|0304|
D= |1 0 2 0| |0 1 0 2| |0 0 -2 0| |0 3 0 4| = |1 0 2 0| |0 1 0 2| |0 0 -2 0| |0 0 0 -2| =4
计算四阶行列式:D=
|1020|
|0102|
|3040|
|0304|
D= |1 0 2 0| |0 1 0 2| |0 0 -2 0| |0 3 0 4| = |1 0 2 0| |0 1 0 2| |0 0 -2 0| |0 0 0 -2| =4