问题
解答题
20-
|
答案
20-
-2 3
-2 15
-2 35
-2 63
,2 99
=20-(
+2 3
+2 15
+2 35
+2 63
),2 99
=20-(1-
+1 3
-1 3
+1 5
-1 5
+1 7
-1 7
+1 9
-1 9
),1 11
=20-(1-
),1 11
=20-
,10 11
=19
.1 11
20-
|
20-
-2 3
-2 15
-2 35
-2 63
,2 99
=20-(
+2 3
+2 15
+2 35
+2 63
),2 99
=20-(1-
+1 3
-1 3
+1 5
-1 5
+1 7
-1 7
+1 9
-1 9
),1 11
=20-(1-
),1 11
=20-
,10 11
=19
.1 11