性质4把行列式的两彳 (列)互换位置,则行列式变号 证明设 i a a a D DI a in nn nn 国园國[回性质4 把行列式的两行 (列)互换位置,则行列式变号. 证明 设 11 1 11 1 1 1 1 1 1 1 1 , . n n i in j jn j jn i in n nn n nn a a a a a a a a D D a a a a a a a a = = " " " " " " " " " " " " " " " " " " " " " " " " "