题目内容
用简便方法计算. 4.96+5.23+4.77 |
29.15-8.92+20.85 |
12.63×5.2-2.63×5.2 | 32×0.125. |
分析:(1)根据加法结合律进行简算;
(2)根据加法交换律进行简算;
(3)根据乘法分配律进行简算;
(4)32=4×8,然后再根据乘法结合律进行简算.
(2)根据加法交换律进行简算;
(3)根据乘法分配律进行简算;
(4)32=4×8,然后再根据乘法结合律进行简算.
解答:解:(1)4.96+5.23+4.77
=4.96+(5.23+4.77)
=4.96+10
=14.96;
(2)29.15-8.92+20.85
=29.15+20.85-8.92
=50-8.92
=41.08;
(3)12.63×5.2-2.63×5.2
=(12.63-2.63)×5.2
=10×5.2
=52;
(4)32×0.125
=(4×8)×0.125
=4×(8×0.125)
=4×1
=4.
=4.96+(5.23+4.77)
=4.96+10
=14.96;
(2)29.15-8.92+20.85
=29.15+20.85-8.92
=50-8.92
=41.08;
(3)12.63×5.2-2.63×5.2
=(12.63-2.63)×5.2
=10×5.2
=52;
(4)32×0.125
=(4×8)×0.125
=4×(8×0.125)
=4×1
=4.
点评:完成本题要注意分析式中数据,运用合适的简便方法计算.
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