题目内容
计算各题,能简算的要简算. 13.6+4.5×2.2 |
3.24×0.4×2.5 |
15.2×101-15.2 | 6.4÷0.4÷2. |
分析:(1)先算乘法,再算加法;
(2)先运用乘法结合律计算0.4×2.5,然后再和3.24相乘即可;
(3)运用乘法分配律进行简算;
(4)根据同级运算,按照从左向右的顺序进行解答即可.
(2)先运用乘法结合律计算0.4×2.5,然后再和3.24相乘即可;
(3)运用乘法分配律进行简算;
(4)根据同级运算,按照从左向右的顺序进行解答即可.
解答:解:①13.6+4.5×2.2
=13.6+9.9
=23.5;
②3.24×0.4×2.5
=3.24×(0.4×2.5)
=3.24×1
=3.24;
③15.2×101-15.2
=15.2×(101-1)
=152;
④6.4÷0.4÷2
=16÷2
=8.
=13.6+9.9
=23.5;
②3.24×0.4×2.5
=3.24×(0.4×2.5)
=3.24×1
=3.24;
③15.2×101-15.2
=15.2×(101-1)
=152;
④6.4÷0.4÷2
=16÷2
=8.
点评:此题是考查四则混合运算,要仔细观察算式的特点,灵活运用一些定律进行简便计算.
![](http://thumb2018.1010pic.com/images/loading.gif)
练习册系列答案
相关题目