问题 解答题
脱式计算
5
12
-
3
8
+
2
3
3
4
+
11
18
-
1
9
7
8
-(
2
5
+
1
10
10
11
+
5
7
+
1
11
+
2
7
答案

(1)

5
12
-
3
8
+
2
3

=

1
24
+
2
3

=

17
24

(2)

3
4
+
11
18
-
1
9

=

3
4
+(
11
18
-
1
9
),

=

3
4
+
1
2

=

5
4

(3)

7
8
-(
2
5
+
1
10
),

=

7
8
-
1
2

=

3
8

(4)

10
11
+
5
7
+
1
11
+
2
7

=(

10
11
+
1
11
)+(
2
7
+
5
7
),

=1+1,

=2.

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