题目内容
用简便方法计算:(要写计算过程.)
①25×125×8×40 | ②52×66+33×52+52 | ③37×99 | ④45×101. |
分析:(1)运用乘法的交换律和结合律进行简算;
(2)运用乘法的分配律进行简算;
(3)运用乘法的分配律进行简算;
(4)运用乘法的分配律进行简算;
(2)运用乘法的分配律进行简算;
(3)运用乘法的分配律进行简算;
(4)运用乘法的分配律进行简算;
解答:解:(1)25×125×8×40,
=(25×40)×(125×8),
=1000×1000,
=1000000;
(2)52×66+33×52+52,
=52×(66+33+1),
=52×100,
=5200;
(3)37×99,
=37×(100-1),
=37×100-37×1,
=3700-37,
=3663;
(4)45×101,
=45×(100+1),
=45×100+45×1,
=4500+45,
=4545;
=(25×40)×(125×8),
=1000×1000,
=1000000;
(2)52×66+33×52+52,
=52×(66+33+1),
=52×100,
=5200;
(3)37×99,
=37×(100-1),
=37×100-37×1,
=3700-37,
=3663;
(4)45×101,
=45×(100+1),
=45×100+45×1,
=4500+45,
=4545;
点评:此题考查了整数乘法运算定律.
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