问题 解答题
脱式计算:
5
6
-
3
4
+
2
3
3
8
+
1
2
-
1
4
5-
4
7
-
3
7
2
3
+(
3
5
-
1
2
4
9
+
3
10
+
5
9
+
7
10
答案

(1)

5
6
-
3
4
+
2
3

=

1
12
+
2
3

=

3
4

(2)

3
8
+
1
2
-
1
4

=

7
8
-
1
4

=

5
8

(3)5-

4
7
-
3
7

=5-(

4
7
+
3
7
),

=5-1,

=4;

(4)

2
3
+(
3
5
-
1
2
),

=

2
3
+
1
10

=

23
30

(5)

4
9
+
3
10
+
5
9
+
7
10

=(

4
9
+
5
9
)+(
3
10
+
7
10
),

=1+1,

=2.

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