设 α 1 =( 6 −2 0 4 ) , α 2 =( −3 1 5 7 ) ,则 3 α 1 −2 α 2 = 设 α 1 =( 6 −2 0 4 ) , α 2 =( −3 1 5 7 ) ,则 3 α 1 −2 α 2 = 发布时间:2025-11-27 03:02:38