题目内容
列式计算
(1)1000减去25与32的积,差是多少?
(2)一个数里有85个320,求这个数?
(3)2个
与4个
的和是多少?
(4)5个
比1少多少?
解:(1)1000-25×32,
=1000-800,
=200;
答:差是200.
(2)320×85=27200;
答:这个数是27200.
(3)
×2+
×4,
=
+
,
=
;
答:和是
.
(4)1-
×5,
=1-
,
=
;
答:比1少
.
分析:(1)先用25乘上32求出积,然后用1000减去求出的积即可;
(2)用320乘上85即可;
(3)2个
就是
×2;4个
就是
×4,分别求出它们的积再相加即可;
(4)5个
就是
×5,先求出它们的积,然后用1减去求出的积即可.
点评:这类型的题目要分清楚数量之间的关系,先求什么再求什么,找清列式的顺序,列出算式求解.
=1000-800,
=200;
答:差是200.
(2)320×85=27200;
答:这个数是27200.
(3)
![](http://thumb.1010pic.com/pic5/latex/847.png)
![](http://thumb.1010pic.com/pic5/latex/847.png)
=
![](http://thumb.1010pic.com/pic5/latex/35.png)
![](http://thumb.1010pic.com/pic5/latex/4458.png)
=
![](http://thumb.1010pic.com/pic5/latex/9777.png)
答:和是
![](http://thumb.1010pic.com/pic5/latex/9777.png)
(4)1-
![](http://thumb.1010pic.com/pic5/latex/113.png)
=1-
![](http://thumb.1010pic.com/pic5/latex/4442.png)
=
![](http://thumb.1010pic.com/pic5/latex/2766.png)
答:比1少
![](http://thumb.1010pic.com/pic5/latex/2766.png)
分析:(1)先用25乘上32求出积,然后用1000减去求出的积即可;
(2)用320乘上85即可;
(3)2个
![](http://thumb.1010pic.com/pic5/latex/847.png)
![](http://thumb.1010pic.com/pic5/latex/847.png)
![](http://thumb.1010pic.com/pic5/latex/847.png)
![](http://thumb.1010pic.com/pic5/latex/847.png)
(4)5个
![](http://thumb.1010pic.com/pic5/latex/113.png)
![](http://thumb.1010pic.com/pic5/latex/113.png)
点评:这类型的题目要分清楚数量之间的关系,先求什么再求什么,找清列式的顺序,列出算式求解.
![](http://thumb2018.1010pic.com/images/loading.gif)
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