题目内容
列式计算.
(1)
与它的倒数的和的4倍加上
,和是多少?
(2)
的倒数加上
除
的商,和是多少?
解:(1)(
+
)×4+
,
=
×4+
,
=
+
,
=
;
答:和是
.
(2)
+
÷
,
=
+
×
,
=
+
,
=
;
答:和是
.
分析:(1)求和,就要知道两个加数分别是多少,根据题意,一个加数是“
与它的倒数的和的4倍”,即(
+
)×4,一个是
,由此列式计算;
(2)求和,就要知道两个加数分别是多少,根据题意,一个加数是“
的倒数”,即
;一个是“
除
的商”,即
÷
,由此列式为
+
÷
,计算即可.
点评:此题考查了倒数的概念,以及“除”与“除以”的区别,在列式时,应注意分清.
![](http://thumb.1010pic.com/pic5/latex/602.png)
![](http://thumb.1010pic.com/pic5/latex/1180.png)
![](http://thumb.1010pic.com/pic5/latex/37778.png)
=
![](http://thumb.1010pic.com/pic5/latex/267554.png)
![](http://thumb.1010pic.com/pic5/latex/37778.png)
=
![](http://thumb.1010pic.com/pic5/latex/56346.png)
![](http://thumb.1010pic.com/pic5/latex/37778.png)
=
![](http://thumb.1010pic.com/pic5/latex/10699.png)
答:和是
![](http://thumb.1010pic.com/pic5/latex/10699.png)
(2)
![](http://thumb.1010pic.com/pic5/latex/15.png)
![](http://thumb.1010pic.com/pic5/latex/4579.png)
![](http://thumb.1010pic.com/pic5/latex/317.png)
=
![](http://thumb.1010pic.com/pic5/latex/15.png)
![](http://thumb.1010pic.com/pic5/latex/4579.png)
![](http://thumb.1010pic.com/pic5/latex/1154.png)
=
![](http://thumb.1010pic.com/pic5/latex/15.png)
![](http://thumb.1010pic.com/pic5/latex/33.png)
=
![](http://thumb.1010pic.com/pic5/latex/36671.png)
答:和是
![](http://thumb.1010pic.com/pic5/latex/36671.png)
分析:(1)求和,就要知道两个加数分别是多少,根据题意,一个加数是“
![](http://thumb.1010pic.com/pic5/latex/602.png)
![](http://thumb.1010pic.com/pic5/latex/602.png)
![](http://thumb.1010pic.com/pic5/latex/1180.png)
![](http://thumb.1010pic.com/pic5/latex/37778.png)
(2)求和,就要知道两个加数分别是多少,根据题意,一个加数是“
![](http://thumb.1010pic.com/pic5/latex/155.png)
![](http://thumb.1010pic.com/pic5/latex/15.png)
![](http://thumb.1010pic.com/pic5/latex/317.png)
![](http://thumb.1010pic.com/pic5/latex/4579.png)
![](http://thumb.1010pic.com/pic5/latex/4579.png)
![](http://thumb.1010pic.com/pic5/latex/317.png)
![](http://thumb.1010pic.com/pic5/latex/15.png)
![](http://thumb.1010pic.com/pic5/latex/4579.png)
![](http://thumb.1010pic.com/pic5/latex/317.png)
点评:此题考查了倒数的概念,以及“除”与“除以”的区别,在列式时,应注意分清.
![](http://thumb2018.1010pic.com/images/loading.gif)
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