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脱式计算,能简算的要简算,写出主要计算过程(1)39×3538(2)3.6×(49+56+518)(3)9×(49+114)+514(4)74×89+49×17.

题目详情
脱式计算,能简算的要简算,写出主要计算过程
(1)39×
35
38
                       
(2)3.6×(
4
9
+
5
6
+
5
18

(3)9×(
4
9
+
1
14
)+
5
14
             
(4)74×
8
9
+
4
9
×
1
7
脱式计算,能简算的要简算,写出主要计算过程
(1)39×
35
38
                       
(2)3.6×(
4
9
+
5
6
+
5
18

(3)9×(
4
9
+
1
14
)+
5
14
             
(4)74×
8
9
+
4
9
×
1
7

35
38
                       
(2)3.6×(
4
9
+
5
6
+
5
18

(3)9×(
4
9
+
1
14
)+
5
14
             
(4)74×
8
9
+
4
9
×
1
7
35
38
353835353838
4
9
+
5
6
+
5
18

(3)9×(
4
9
+
1
14
)+
5
14
             
(4)74×
8
9
+
4
9
×
1
7
4
9
494499
5
6
+
5
18

(3)9×(
4
9
+
1
14
)+
5
14
             
(4)74×
8
9
+
4
9
×
1
7
5
6
565566
5
18

(3)9×(
4
9
+
1
14
)+
5
14
             
(4)74×
8
9
+
4
9
×
1
7
5
18
518551818
4
9
+
1
14
)+
5
14
             
(4)74×
8
9
+
4
9
×
1
7
4
9
494499
1
14
)+
5
14
             
(4)74×
8
9
+
4
9
×
1
7
1
14
114111414
5
14
             
(4)74×
8
9
+
4
9
×
1
7
5
14
514551414
8
9
+
4
9
×
1
7
8
9
898899
4
9
×
1
7
4
9
494499
1
7
1
7
171177
▼优质解答
答案和解析
(1)39×
35
38

=(38+1)×
35
38

=38×
35
38
+1×
35
38

=35+
35
38

=35
35
38


(2)3.6×(
4
9
+
5
6
+
5
18

=3.6×
4
9
+3.6×
5
6
+3.6×
5
18

=1.6+3+1
=5.6;

(3)9×(
4
9
+
1
14
)+
5
14

=9×
4
9
+9×
1
14
+
5
14

=4+
9
14
+
5
14

=4+(
9
14
+
5
14

=4+1
=5;

(4)74×
8
9
+
4
9
×
1
7

=65
7
9
+
4
63

=65
53
63
35
38
3538353535383838
=(38+1)×
35
38

=38×
35
38
+1×
35
38

=35+
35
38

=35
35
38


(2)3.6×(
4
9
+
5
6
+
5
18

=3.6×
4
9
+3.6×
5
6
+3.6×
5
18

=1.6+3+1
=5.6;

(3)9×(
4
9
+
1
14
)+
5
14

=9×
4
9
+9×
1
14
+
5
14

=4+
9
14
+
5
14

=4+(
9
14
+
5
14

=4+1
=5;

(4)74×
8
9
+
4
9
×
1
7

=65
7
9
+
4
63

=65
53
63
35
38
3538353535383838
=38×
35
38
+1×
35
38

=35+
35
38

=35
35
38


(2)3.6×(
4
9
+
5
6
+
5
18

=3.6×
4
9
+3.6×
5
6
+3.6×
5
18

=1.6+3+1
=5.6;

(3)9×(
4
9
+
1
14
)+
5
14

=9×
4
9
+9×
1
14
+
5
14

=4+
9
14
+
5
14

=4+(
9
14
+
5
14

=4+1
=5;

(4)74×
8
9
+
4
9
×
1
7

=65
7
9
+
4
63

=65
53
63
35
38
3538353535383838+1×
35
38

=35+
35
38

=35
35
38


(2)3.6×(
4
9
+
5
6
+
5
18

=3.6×
4
9
+3.6×
5
6
+3.6×
5
18

=1.6+3+1
=5.6;

(3)9×(
4
9
+
1
14
)+
5
14

=9×
4
9
+9×
1
14
+
5
14

=4+
9
14
+
5
14

=4+(
9
14
+
5
14

=4+1
=5;

(4)74×
8
9
+
4
9
×
1
7

=65
7
9
+
4
63

=65
53
63
35
38
3538353535383838
=35+
35
38

=35
35
38


(2)3.6×(
4
9
+
5
6
+
5
18

=3.6×
4
9
+3.6×
5
6
+3.6×
5
18

=1.6+3+1
=5.6;

(3)9×(
4
9
+
1
14
)+
5
14

=9×
4
9
+9×
1
14
+
5
14

=4+
9
14
+
5
14

=4+(
9
14
+
5
14

=4+1
=5;

(4)74×
8
9
+
4
9
×
1
7

=65
7
9
+
4
63

=65
53
63
35
38
3538353535383838
=35
35
38


(2)3.6×(
4
9
+
5
6
+
5
18

=3.6×
4
9
+3.6×
5
6
+3.6×
5
18

=1.6+3+1
=5.6;

(3)9×(
4
9
+
1
14
)+
5
14

=9×
4
9
+9×
1
14
+
5
14

=4+
9
14
+
5
14

=4+(
9
14
+
5
14

=4+1
=5;

(4)74×
8
9
+
4
9
×
1
7

=65
7
9
+
4
63

=65
53
63
35
38
3538353535383838;

(2)3.6×(
4
9
+
5
6
+
5
18

=3.6×
4
9
+3.6×
5
6
+3.6×
5
18

=1.6+3+1
=5.6;

(3)9×(
4
9
+
1
14
)+
5
14

=9×
4
9
+9×
1
14
+
5
14

=4+
9
14
+
5
14

=4+(
9
14
+
5
14

=4+1
=5;

(4)74×
8
9
+
4
9
×
1
7

=65
7
9
+
4
63

=65
53
63
4
9
49444999+
5
6
+
5
18

=3.6×
4
9
+3.6×
5
6
+3.6×
5
18

=1.6+3+1
=5.6;

(3)9×(
4
9
+
1
14
)+
5
14

=9×
4
9
+9×
1
14
+
5
14

=4+
9
14
+
5
14

=4+(
9
14
+
5
14

=4+1
=5;

(4)74×
8
9
+
4
9
×
1
7

=65
7
9
+
4
63

=65
53
63
5
6
56555666+
5
18

=3.6×
4
9
+3.6×
5
6
+3.6×
5
18

=1.6+3+1
=5.6;

(3)9×(
4
9
+
1
14
)+
5
14

=9×
4
9
+9×
1
14
+
5
14

=4+
9
14
+
5
14

=4+(
9
14
+
5
14

=4+1
=5;

(4)74×
8
9
+
4
9
×
1
7

=65
7
9
+
4
63

=65
53
63
5
18
518555181818)
=3.6×
4
9
+3.6×
5
6
+3.6×
5
18

=1.6+3+1
=5.6;

(3)9×(
4
9
+
1
14
)+
5
14

=9×
4
9
+9×
1
14
+
5
14

=4+
9
14
+
5
14

=4+(
9
14
+
5
14

=4+1
=5;

(4)74×
8
9
+
4
9
×
1
7

=65
7
9
+
4
63

=65
53
63
4
9
49444999+3.6×
5
6
+3.6×
5
18

=1.6+3+1
=5.6;

(3)9×(
4
9
+
1
14
)+
5
14

=9×
4
9
+9×
1
14
+
5
14

=4+
9
14
+
5
14

=4+(
9
14
+
5
14

=4+1
=5;

(4)74×
8
9
+
4
9
×
1
7

=65
7
9
+
4
63

=65
53
63
5
6
56555666+3.6×
5
18

=1.6+3+1
=5.6;

(3)9×(
4
9
+
1
14
)+
5
14

=9×
4
9
+9×
1
14
+
5
14

=4+
9
14
+
5
14

=4+(
9
14
+
5
14

=4+1
=5;

(4)74×
8
9
+
4
9
×
1
7

=65
7
9
+
4
63

=65
53
63
5
18
518555181818
=1.6+3+1
=5.6;

(3)9×(
4
9
+
1
14
)+
5
14

=9×
4
9
+9×
1
14
+
5
14

=4+
9
14
+
5
14

=4+(
9
14
+
5
14

=4+1
=5;

(4)74×
8
9
+
4
9
×
1
7

=65
7
9
+
4
63

=65
53
63
4
9
49444999+
1
14
)+
5
14

=9×
4
9
+9×
1
14
+
5
14

=4+
9
14
+
5
14

=4+(
9
14
+
5
14

=4+1
=5;

(4)74×
8
9
+
4
9
×
1
7

=65
7
9
+
4
63

=65
53
63
1
14
114111141414)+
5
14

=9×
4
9
+9×
1
14
+
5
14

=4+
9
14
+
5
14

=4+(
9
14
+
5
14

=4+1
=5;

(4)74×
8
9
+
4
9
×
1
7

=65
7
9
+
4
63

=65
53
63
5
14
514555141414
=9×
4
9
+9×
1
14
+
5
14

=4+
9
14
+
5
14

=4+(
9
14
+
5
14

=4+1
=5;

(4)74×
8
9
+
4
9
×
1
7

=65
7
9
+
4
63

=65
53
63
4
9
49444999+9×
1
14
+
5
14

=4+
9
14
+
5
14

=4+(
9
14
+
5
14

=4+1
=5;

(4)74×
8
9
+
4
9
×
1
7

=65
7
9
+
4
63

=65
53
63
1
14
114111141414+
5
14

=4+
9
14
+
5
14

=4+(
9
14
+
5
14

=4+1
=5;

(4)74×
8
9
+
4
9
×
1
7

=65
7
9
+
4
63

=65
53
63
5
14
514555141414
=4+
9
14
+
5
14

=4+(
9
14
+
5
14

=4+1
=5;

(4)74×
8
9
+
4
9
×
1
7

=65
7
9
+
4
63

=65
53
63
9
14
914999141414+
5
14

=4+(
9
14
+
5
14

=4+1
=5;

(4)74×
8
9
+
4
9
×
1
7

=65
7
9
+
4
63

=65
53
63
5
14
514555141414
=4+(
9
14
+
5
14

=4+1
=5;

(4)74×
8
9
+
4
9
×
1
7

=65
7
9
+
4
63

=65
53
63
9
14
914999141414+
5
14

=4+1
=5;

(4)74×
8
9
+
4
9
×
1
7

=65
7
9
+
4
63

=65
53
63
5
14
514555141414)
=4+1
=5;

(4)74×
8
9
+
4
9
×
1
7

=65
7
9
+
4
63

=65
53
63
8
9
89888999+
4
9
×
1
7

=65
7
9
+
4
63

=65
53
63
4
9
49444999×
1
7

=65
7
9
+
4
63

=65
53
63
1
7
17111777
=65
7
9
+
4
63

=65
53
63
7
9
79777999+
4
63

=65
53
63
4
63
463444636363
=65
53
63
53
63
5363535353636363.