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.
(1)
4
15
×75
(2)
7
18
×
9
14

(3)
9
14
×21×
2
9

(4)
11
14
×
7
10
×
8
33

(5)
3
4
×
2
5
+
3
5
×
3
4

(6)
4
5
×
5
8
+
5
12
×
4
5

(7)
9
20
×(
2
3
-
3
7

(8)(
5
6
+
5
8
)×
8
25

(1)
4
15
×75,
=
4
15
×(15×5),
=(
4
15
×15)×5,
=4×5,
=20;

(2)
7
18
×
9
14
=
1
4


(3)
9
14
×21×
2
9

=
27
2
×
2
9

=3;

(4)
11
14
×
7
10
×
8
33

=
11
20
×
8
33

=
2
15


(5)
3
4
×
2
5
+
3
5
×
3
4

=
3
4
×(
2
5
+
3
5
),
=
3
4


(6)
4
5
×
5
8
+
5
12
×
4
5

=
1
2
+
1
3

=
5
6


(7)
9
20
×(
2
3
-
3
7
),
=
9
20
×
5
21

=
3
28


(8)(
5
6
+
5
8
)×
8
25

=
5
6
×
8
25
+
5
8
×
8
25

=
4
15
+
1
5

=
7
15
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