问题 解答题
脱式计算.
18
19
-
7
19
-
8
19

15
16
-
3
8
-
1
2

15
24
-
5
24
-
1
24
答案

(1)

18
19
-
7
19
-
8
19

=

18
19
-(
7
19
+
8
19
),

=

18
19
-
15
19

=

3
19

(2)

15
16
-
3
8
-
1
2

=

15
16
-
6
16
-
8
16

=

15
16
-(
6
16
+
8
16

=

15
16
-
14
16

=

1
16

(3)

15
24
-
5
24
-
1
24

=

10
24
-
1
24

=

9
24

=

3
8

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