题目内容
用简便方法计算. 37+125+63+175 |
75×56-56×28 |
101×78 | 125×32×25= |
36×99+36 | 6000÷125÷8 |
68×25×4= | 45×37+56×37-37= |
分析:(1)根据加法交换律和结合律进行简算;
(2)根据乘法分配律进行简算;
(3)把101看作(100+1),运用乘法分配律简算;
(4)把32写成8×4的形式,用乘法结合律进行简算;
(5)根据乘法分配律进行简算;
(6)根据除法的性质进行简算;
(7)根据乘法结合律进行简算;
(8)根据乘法分配律进简算.
(2)根据乘法分配律进行简算;
(3)把101看作(100+1),运用乘法分配律简算;
(4)把32写成8×4的形式,用乘法结合律进行简算;
(5)根据乘法分配律进行简算;
(6)根据除法的性质进行简算;
(7)根据乘法结合律进行简算;
(8)根据乘法分配律进简算.
解答:解:(1)37+125+63+175
=(37+63)+(125+175)
=100+300
=400;
(2)75×56-56×28
=56×(75-28)
=56×47
=2632;
(3)101×78
=(100+1)×78
=100×78+1×78
=7800+78
=7878;
(4)125×32×25
=125×(8×4)×25
=(125×8)×(4×25)
=1000×100
=100000;
(5)36×99+36
=36×(99+1)
=36×100
=3600;
(6)6000÷125÷8
=6000÷(125×8)
=6000÷1000
=6;
(7)68×25×4
=68×(25×4)
=68×100
=6800;
(8)45×37+56×37-37
=37×(45+56-1)
=37×100
=3700.
=(37+63)+(125+175)
=100+300
=400;
(2)75×56-56×28
=56×(75-28)
=56×47
=2632;
(3)101×78
=(100+1)×78
=100×78+1×78
=7800+78
=7878;
(4)125×32×25
=125×(8×4)×25
=(125×8)×(4×25)
=1000×100
=100000;
(5)36×99+36
=36×(99+1)
=36×100
=3600;
(6)6000÷125÷8
=6000÷(125×8)
=6000÷1000
=6;
(7)68×25×4
=68×(25×4)
=68×100
=6800;
(8)45×37+56×37-37
=37×(45+56-1)
=37×100
=3700.
点评:此题考查了灵活运用整数运算定律进行简便计算,注意认真观察数据,再根据数据特点,选择合适的简便方法计算.
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