题目内容

计算:
7
8
+
1
4
-
1
8
+
3
4
7
9
-(
1
3
+
4
9
2.6-1
1
5
+
3
4
0.5-
1
3
+
1
8
(1)
7
8
+
1
4
-
1
8
+
3
4

=(
7
8
-
1
8
)+(
1
4
+
3
4
),
=
3
4
+
1,
=1
3
4


(2)
7
9
-(
1
3
+
4
9
),
=
7
9
-
4
9
-
1
3

=
1
3
-
1
3

=0;

(3)2.6-1
1
5
+
3
4

=1.4+
3
4

=2.15;

(4)0.5-
1
3
+
1
8

=
1
6
+
1
8

=
7
24
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