问题
填空题
化简后
|
答案
+3-2 2
+5-2 6
+7-2 12
+9-2 20
+11-2 30
+13-2 42
+15-2 56
=17-2 72
=
-1+2
-3
+2
-4
+3
-5
+4
-6
+5
-7
+6
-8
+7
-9 8
=3-1
=2.
故答案为:2.
化简后
|
+3-2 2
+5-2 6
+7-2 12
+9-2 20
+11-2 30
+13-2 42
+15-2 56
=17-2 72
=
-1+2
-3
+2
-4
+3
-5
+4
-6
+5
-7
+6
-8
+7
-9 8
=3-1
=2.
故答案为:2.