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)415×75(2)718×914(3)914×21×29(4)1114×710×833(5)34×25+35×34(6)45×58+512×4

题目简介

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)415×75(2)718×914(3)914×21×29(4)1114×710×833(5)34×25+35×34(6)45×58+512×4

题目详情

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
题型:解答题难度:中档来源:不详

答案


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

(2)class="stub"7
18
×class="stub"9
14
=class="stub"1
4


(3)class="stub"9
14
×21×class="stub"2
9

=class="stub"27
2
×class="stub"2
9

=3;

(4)class="stub"11
14
×class="stub"7
10
×class="stub"8
33

=class="stub"11
20
×class="stub"8
33

=class="stub"2
15


(5)class="stub"3
4
×class="stub"2
5
+class="stub"3
5
×class="stub"3
4

=class="stub"3
4
×(class="stub"2
5
+class="stub"3
5
),
=class="stub"3
4


(6)class="stub"4
5
×class="stub"5
8
+class="stub"5
12
×class="stub"4
5

=class="stub"1
2
+class="stub"1
3

=class="stub"5
6


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

=class="stub"3
28


(8)(class="stub"5
6
+class="stub"5
8
)×class="stub"8
25

=class="stub"5
6
×class="stub"8
25
+class="stub"5
8
×class="stub"8
25

=class="stub"4
15
+class="stub"1
5

=class="stub"7
15

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