题目内容

阅读以下材料:观察下列等式,找找规律
1
2
+1
=
2
-1
(
2
+1)(
2
-1)
=
2
-1

1
3
+
2
=
3
-
2
(
3
+
2
)(
3
-
2
)
=
3
-
2

1
4
+
3
=
4
-
3
(
4
+
3
)(
4
-
3
)
=
4
-
3

(1)化简:
1
2
3
+
11

(2)计算:
1
1+
2
+
1
2
+
3
+
1
3
+
4
+…+
1
9
+
10
(1)
1
2
3
+
11
=2
3
-
11

(2)
1
1+
2
+
1
2
+
3
+
1
3
+
4
+…+
1
9
+
10

=
2
-1+
3
-
2
+
4
-
3
+…+
10
-
9

=
10
-1
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