题目内容

递等式计算(能简算的要简算)
8
9
-(
1
18
+
7
9

2
3
+
6
7
-
2
3
+
6
7

999.3-998.2+997.3-996.2+…+3.3-2.2+1.3-0.2
7
6
+
13
12
+
21
20
+
31
30
+
43
42
+
57
56
+
73
72
+
91
90
(1)
8
9
-(
1
18
+
7
9
),
=
8
9
-
1
18
-
7
9

=
8
9
-
7
9
-
1
18

=
1
9
-
1
18

=
1
18


(2)
2
3
+
6
7
-
2
3
+
6
7

=(
2
3
-
2
3
)+(
6
7
+
6
7
),
=0+
12
7

=
12
7


(3)999.3-998.2+997.3-996.2+…+3.3-2.2+1.3-0.2,
=(999.3-998.2)+(997.3-996.2)+…+(3.3-2.2)+(1.3-0.2),
=1.1+1.1+…+1.1(500个1.1),
=1.1×500,
=550;

(4)
7
6
+
13
12
+
21
20
+
31
30
+
43
42
+
57
56
+
73
72
+
91
90

=1+1+1+1+1+1+1+1+
1
6
+
1
12
+
1
20
+
1
30
+
1
42
+
1
56
+
1
72
+
1
90

=8+
1
2
-
1
3
+
1
3
-
1
4
+…+
1
9
-
1
10

=8+
1
2
-
1
10

=8
2
5
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