题目内容
能简算的要简算
2005-![]() | ![]() ![]() ![]() | ![]() ![]() |
解:
(1)2005-
,
=2005-
÷
,
=2005-8,
=1997;
(2)
÷[(
)÷
],
=
÷[
÷
],
=
÷
,
=4;
(3)
÷7+
,
=
×
+
,
=(
+
)×
,
=
×
,
=
.
分析:(1)先算乘法,再算除法,最后算减法;
(2)先算小括号里面的减法,再算中括号里面的除法.最后算括号外面的除法;
(3)根据乘法分配律进行简算.
点评:四则运算,先弄清运算顺序,然后再进一步计算即可,能简算的要简算.
(1)2005-
![](http://thumb.1010pic.com/pic5/latex/182948.png)
=2005-
![](http://thumb.1010pic.com/pic5/latex/8.png)
![](http://thumb.1010pic.com/pic5/latex/5.png)
=2005-8,
=1997;
(2)
![](http://thumb.1010pic.com/pic5/latex/602.png)
![](http://thumb.1010pic.com/pic5/latex/182949.png)
![](http://thumb.1010pic.com/pic5/latex/5192.png)
=
![](http://thumb.1010pic.com/pic5/latex/602.png)
![](http://thumb.1010pic.com/pic5/latex/112.png)
![](http://thumb.1010pic.com/pic5/latex/5192.png)
=
![](http://thumb.1010pic.com/pic5/latex/602.png)
![](http://thumb.1010pic.com/pic5/latex/36.png)
=4;
(3)
![](http://thumb.1010pic.com/pic5/latex/2367.png)
![](http://thumb.1010pic.com/pic5/latex/182950.png)
=
![](http://thumb.1010pic.com/pic5/latex/2367.png)
![](http://thumb.1010pic.com/pic5/latex/847.png)
![](http://thumb.1010pic.com/pic5/latex/182950.png)
=(
![](http://thumb.1010pic.com/pic5/latex/2367.png)
![](http://thumb.1010pic.com/pic5/latex/60986.png)
![](http://thumb.1010pic.com/pic5/latex/847.png)
=
![](http://thumb.1010pic.com/pic5/latex/1412.png)
![](http://thumb.1010pic.com/pic5/latex/847.png)
=
![](http://thumb.1010pic.com/pic5/latex/36.png)
分析:(1)先算乘法,再算除法,最后算减法;
(2)先算小括号里面的减法,再算中括号里面的除法.最后算括号外面的除法;
(3)根据乘法分配律进行简算.
点评:四则运算,先弄清运算顺序,然后再进一步计算即可,能简算的要简算.
![](http://thumb2018.1010pic.com/images/loading.gif)
练习册系列答案
相关题目