问题 解答题
计算:
1
8
+
1
4
+
7
8
   
1
2
-
1
3
+
4
5
2.5-1
2
5
+
3
4
0.5-
1
3
+
1
4
答案

(1)

1
8
+
1
4
+
7
8

=

1
8
+
7
8
+
1
4

=1+

1
4

=1

1
4

(2)

1
2
-
1
3
+
4
5

=

1
6
+
4
5

=

29
30

(3)2.5-

2
5
+
3
4

=2.5-0.4+0.75,

=2.1+0.75,

=2.85;

(4)0.5-

1
3
+
1
4

=

1
2
-
1
3
+
1
4

=

1
6
+
1
4

=

5
12

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