题目内容

计算
13
20
+
2
5
-
3
20
18.76-3.47-0.530.75+
3
5
+
1
4
+
2
5
3
1
4
-
7
16
+
3
4
3
1
6
+
7
8
+5
5
6
+
1
8
1-
2
9
-
7
9
(1)
13
20
+
2
5
-
3
20

=(
13
20
-
3
20
)+
2
5

=
1
2
+
2
5

=
9
10


(2)18.76-3.47-0.53,
=18.76-(3.47+0.53),
=18.76-4,
=14.76;

(3)0.75+
3
5
+
1
4
+
2
5

=(0.75+
1
4
)+(
3
5
+
2
5
),
=(075+0.25)+1,
=1+1,
=2;

(4)3
1
4
-
7
16
+
3
4

=(3
1
4
+
3
4
)-
7
16

=4-
7
16

=3
9
16


(5)3
1
6
+
7
8
+5
5
6
+
1
8

=(3
1
6
+5
5
6
)+(
7
8
+
1
8
),
=9+1,
=10;

(6)1-
2
9
-
7
9

=1-(
2
9
+
7
9
),
=1-1,
=0.
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