题目内容
怎样简便就怎样算 25×125×8×40 |
52×66+34×52 |
27+428+173+72 |
45×101. |
分析:(1)25×125×8×40,运用乘法交换律和结合律进行简算;
(2)52×66+34×52,运用乘法分配律进行简算;
(3)27+428+173+72,运用加法交换律和结合律进行简算;
(4)45×101,运用乘法分配律进行简算.
(2)52×66+34×52,运用乘法分配律进行简算;
(3)27+428+173+72,运用加法交换律和结合律进行简算;
(4)45×101,运用乘法分配律进行简算.
解答:解:(1)25×125×8×40,
=(25×40)×(125×8),
=1000×1000,
=1000000;
(2)52×66+34×52,
=(66+34)×52,
=100×52,
=5200;
(3)27+428+173+72,
=(27+173)+(428+72),
=200+500,
=700;
(4)45×101,
=45×100+45×1,
=4500+45,
=4545.
=(25×40)×(125×8),
=1000×1000,
=1000000;
(2)52×66+34×52,
=(66+34)×52,
=100×52,
=5200;
(3)27+428+173+72,
=(27+173)+(428+72),
=200+500,
=700;
(4)45×101,
=45×100+45×1,
=4500+45,
=4545.
点评:此题考查的目的是理解掌握加法、乘法的运算定律,并且能够灵活运用加法、乘法的运算定律进行简便计算.
练习册系列答案
相关题目