1/30+1/42+1/56+1/72+1/90+1/110+1/132=_.

问题描述:

1
30
+
1
42
+
1
56
+
1
72
+
1
90
+
1
110
+
1
132
=______.

1
30
+
1
42
+
1
56
+
1
72
+
1
90
+
1
110
+
1
132

=
1
5
-
1
6
+
1
6
-
1
7
+
1
7
-
1
8
+
1
8
-
1
9
+
1
9
-
1
10
+
1
10
-
1
11
+
1
11
-
1
12

=
1
5
-
1
12

=
7
60

故答案为:
7
60