应要求用2
3 1 1 1
1 3 1 1
1 1 3 1
1 1 1 3
按第1行展开:
3*
3 1 1
1 3 1
1 1 3
-
1 1 1
1 3 1
1 1 3
+
1 3 1
1 1 1
1 1 3
-
1 3 1
1 1 3
1 1 1
= 60 - 4 - 4 - 4 = 48
应要求用2
3 1 1 1
1 3 1 1
1 1 3 1
1 1 1 3
按第1行展开:
3*
3 1 1
1 3 1
1 1 3
-
1 1 1
1 3 1
1 1 3
+
1 3 1
1 1 1
1 1 3
-
1 3 1
1 1 3
1 1 1
= 60 - 4 - 4 - 4 = 48