题目内容
口算 1- ![]() ![]() | 0.24×0.5= | 0.52+0.12= | 1.25×8÷1.25×8= |
![]() ![]() | ![]() ![]() ![]() ![]() | 4-![]() ![]() | 2÷5÷![]() ![]() |
解:1-
÷
=
; 0.24×0.5=0.12; 0.52+0.12=0.26; 1.25×8÷1.25×8=64;
×
×30=12;
+
-
+
=
; 4-
-
=3; 2÷5÷
×
=
;
故答案为:
,0.12,0.26,64,12,
,3,
.
分析:①先算除法,再算减法;②先算24×5,然后在得数中从后向前数出三位,点上小数点;③先算乘方,再算加法;④⑧按运算顺序从左往右依次运算;⑤约分计算;⑥运用加法交换律与结合律简算;⑦运用减法的性质简算.
点评:考查了四则混合运算,注意运算顺序和运算法则,灵活运用所学的运算定律简便计算.
![](http://thumb.1010pic.com/pic5/latex/764.png)
![](http://thumb.1010pic.com/pic5/latex/1207.png)
![](http://thumb.1010pic.com/pic5/latex/113.png)
![](http://thumb.1010pic.com/pic5/latex/14.png)
![](http://thumb.1010pic.com/pic5/latex/168.png)
![](http://thumb.1010pic.com/pic5/latex/597.png)
![](http://thumb.1010pic.com/pic5/latex/5192.png)
![](http://thumb.1010pic.com/pic5/latex/5192.png)
![](http://thumb.1010pic.com/pic5/latex/597.png)
![](http://thumb.1010pic.com/pic5/latex/365.png)
![](http://thumb.1010pic.com/pic5/latex/1154.png)
![](http://thumb.1010pic.com/pic5/latex/4458.png)
![](http://thumb.1010pic.com/pic5/latex/602.png)
![](http://thumb.1010pic.com/pic5/latex/168.png)
![](http://thumb.1010pic.com/pic5/latex/8.png)
故答案为:
![](http://thumb.1010pic.com/pic5/latex/113.png)
![](http://thumb.1010pic.com/pic5/latex/365.png)
![](http://thumb.1010pic.com/pic5/latex/8.png)
分析:①先算除法,再算减法;②先算24×5,然后在得数中从后向前数出三位,点上小数点;③先算乘方,再算加法;④⑧按运算顺序从左往右依次运算;⑤约分计算;⑥运用加法交换律与结合律简算;⑦运用减法的性质简算.
点评:考查了四则混合运算,注意运算顺序和运算法则,灵活运用所学的运算定律简便计算.
![](http://thumb2018.1010pic.com/images/loading.gif)
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