问题 解答题
脱式计算
4
5
-
3
10
+
2
3
7
8
-
5
12
+
1
6
6-(
3
4
-
2
5
4
5
+
11
15
+
3
10
1
10
+
3
8
-
2
5
3
5
-(
2
15
+
1
3
答案

(1)

4
5
-
3
10
+
2
3

=

24
30
-
9
30
+
20
30

=

7
6

(2)

7
8
-
5
12
+
1
6

=

21
24
-
10
24
+
4
24

=

5
8

(3)6-(

3
4
-
2
5
),

=6-

7
20

=5

13
20

(4)

4
5
+
11
15
+
3
10

=

24
30
+
22
30
+
9
30

=

11
6

(5)

1
10
+
3
8
-
2
5

=

4
40
+
15
40
-
16
40

=

3
40

(6)

3
5
-(
2
15
+
1
3
),

=

3
5
-
7
15

=

2
15

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