5+6/5×6−6+7/6×7+7+8/7×8−8+9/8×9+9+10/9×10.

问题描述:

5+6
5×6
6+7
6×7
+
7+8
7×8
8+9
8×9
+
9+10
9×10

5+6
5×6
-
6+7
6×7
+
7+8
7×8
8+9
8×9
+
9+10
9×10

=
1
5
+
1
6
1
6
1
7
+
1
7
+
1
8
1
8
1
9
+
1
9
+
1
10

=
1
5
+
1
10

=
3
10