题目内容
350÷25
40000÷125
8200÷125.
40000÷125
8200÷125.
分析:这三个题目可以运用商不变规律进行简算.
解答:解:(1)350÷25,
=(350×4)÷(25×4),
=1400÷100,
=14;
(2)40000÷125,
=(40000×8)÷(125×8),
=320000÷1000,
=320;
(3)8200÷125,
=(8200×8)÷(125×8),
=65600÷1000,
=65.6.
=(350×4)÷(25×4),
=1400÷100,
=14;
(2)40000÷125,
=(40000×8)÷(125×8),
=320000÷1000,
=320;
(3)8200÷125,
=(8200×8)÷(125×8),
=65600÷1000,
=65.6.
点评:商不变规律:被除数和除数同时乘或除以一个不为0的数,商不变.
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我来举几个例子.
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数学辩论会.
![]()
![]()
|
(1)30 ×13= |
(2)74 ×20= |
(3)40 ×81= |
|
30 ×130= |
74 ×200= |
40 ×810= |
|
3 ×1300= |
740 ×20= |
400 ×81= |
|
30 ×1300= |
7400 ×2= |
4 ×8100= |
![]()
![]()
|
(4)50 ×13= |
(5)35 ×20= |
(6)150 ×6= |
|
50 ×130= |
350 ×20= |
150 ×60= |
|
500 ×130= |
350 ×200= |
15000 ×6= |
|
50 ×1300= |
3500 ×20= |
1500 ×60= |
![]()
![]()
![]()
我来举几个例子.
25
×4=100250
×4=100025
×400=10000250
×40=10000请你帮小巧填一填.
![]()
![]()