题目内容

脱式计算,能简算的要简算
15
16
-
1
4
-
1
8

7
8
-
5
24
+
11
24

8
9
-
3
8
-
1
8

3
11
+
3
4
+0.25.
(1)
15
16
-
1
4
-
1
8
,
=
15
16
-
4
16
-
2
16
,
=
9
16
;

(2)
7
8
-
5
24
+
11
24
,
=
21
24
-
5
24
+
11
24

=
9
8
;

(3)
8
9
-
3
8
-
1
8
,
=
8
9
-(
3
8
+
1
8
),
=
8
9
-
1
2
,
=
7
18
;

(4)
3
11
+
3
4
+0.25,
=
3
11
+(
3
4
+
1
4
),
=
3
11
+1,
=1
3
11
.
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