题目内容

下面各题写出必要的计算过程,能简便计算的要简便计算.
4
15
×75
7
18
×
9
14
9
14
×21×
2
9
11
14
×
7
10
×
8
33
3
4
×
2
5
+
3
5
×
3
4
4
5
×
5
8
+
5
12
×
4
5
9
20
×(
2
3
-
3
7
)
(
5
6
+
5
8
)×
8
25
4
15
×25
8
27
×39
45×
6
35
13×
5
26
5
27
×9×
3
5
4
5
×
5
8
×
5
12
9
14
×21×
2
9
7
9
×
27
49
×
5
7
17×
9
16
(
3
4
+
5
8
)×32
5
9
×
3
4
+
5
9
×
1
4
5
4
×
1
8
×16
1
5
+
2
9
×
3
10
44-72×
5
12
.
4
15
×75=20;
7
18
×
9
14
=
1
4
;

9
14
×21×
2
9
=3;

11
14
×
7
10
×
8
33
=
2
15
;

3
4
×
2
5
+
3
5
×
3
4
,
=(
2
5
+
3
5
)×
3
4
,
=
3
4
;

4
5
×
5
8
+
5
12
×
4
5
,
=
1
2
+
1
3
,
=
5
6
;

9
20
×(
2
3
-
3
7
),
=
9
20
×
2
3
-
9
20
×
3
7
,
=
3
10
-
27
140
,
=
3
28
;

(
5
6
+
5
8
)×
8
25
,
=
5
6
×
8
25
+
5
8
×
8
25
,
=
4
15
+
1
5
,
=
7
15
;

4
15
×25
8
27
×39,
=
4
15
×
683
27
×39,
=
35516
135
;

45×
6
35
=
54
7
;

13×
5
26
=
5
2
;
5
27
×9×
3
5
=1;

4
5
×
5
8
×
5
12
=
5
24
;

9
14
×21×
2
9
=3;

7
9
×
27
49
×
5
7
=
15
49
;

17×
9
16
=9
9
16
;

(
3
4
+
5
8
)×32,
=
3
4
×32+
5
8
×32,
=24+20,
=44;

5
9
×
3
4
+
5
9
×
1
4
,
=(
3
4
+
1
4
)×
5
9
,
=
5
9
;

5
4
×
1
8
×16=
5
2
;

1
5
+
2
9
×
3
10
,
=
1
5
+
1
15
,
=
4
15
;

44-72×
5
12
,
=44-30,
=14.
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