题目内容

简便计算:
2.37×6.3+2.37×3.7                      
2.5×1.25×0.32
4.4×25              
2.64÷5÷0.2              
3.8×10.1.
分析:(1)可根据乘法分配律计算;
(2)可将0.32拆分为0.8×0.4后,根据乘法交换律与结合律计算;
(3)可将4.4拆分为4+0.4后根据乘法分配律计算;
(4)可根据一个数除以两个数,等于用这个数除以这两个数的积的除法性质计算;
(5)可将10.1拆分为10+0.1后根据乘法分配律计算.
解答:解:(1)2.37×6.3+2.37×3.7
=(6.3+3.7)×2.37,
=10×2.37,
=23.7;

(2)2.5×1.25×0.32
=2.5×1.25××0.4×0.8,
=(2.5×0.4)×(1.25×0.8),
=1×1,
=1;

(3)4.4×25 
=(4+0.4)×25,
=4×25+0.4×25,
=100+10,
=110;

(4)2.64÷5÷0.2
=2.64÷(5×0.2),
=2.64÷1,
=2.64;

(5)3.8×10.1
=3.8×(10+0.1),
=3.8×10+3.8×0.1,
=38+0.38,
=38.38.
点评:完成本题要注意分析式中数据及运算符号,运用合适的运算定律计算.
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