题目内容

递等式计算(能简算的要简算)
1
8
+
2
15
+
7
8
5
6
-(
1
2
+
1
3
)
9
16
+
3
4
+
7
16
+
5
4
11-
7
10
-
3
10
   
1
2
+
3
10
-
1
5
1
2
+
1
6
+
1
12
+…+
1
90
.
①
1
8
+
2
15
+
7
8
,
=(
1
8
+
7
8
)+
2
15
,
=1
2
15
;

②
5
6
-(
1
2
+
1
3
),
=
5
6
-(
3
6
+
2
6
),
=
5
6
-
5
6
,
=0;

③
9
16
+
3
4
+
7
16
+
5
4
,
=(
9
16
+
7
16
)+(
3
4
+
5
4
),
=1+2,
=3;

④11-
7
10
-
3
10
,
=11-(
7
10
+
3
10
),
=11-1,
=10;

⑤
1
2
+
3
10
-
1
5
,
=
5
10
+
3
10
-
2
10
,
=
6
10
,
=
3
5
;

⑥
1
2
+
1
6
+
1
12
+…+
1
90
,
=1-
1
2
+
1
2
-
1
3
+
1
3
-
1
4
+…
1
9
-
1
10
,
=1-
1
10
,
=
9
10
;
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