题目内容
直接写得数![]() ![]() | ![]() ![]() | ![]() ![]() | ![]() |
2-![]() | 3÷7= | ![]() ![]() | ![]() |
解:(1)
+
=1; (2)
=
; (3)
=
; (4)
5=
;
(5)2-
=
; (6)3÷7=
; (7)
=
; (8)
4=
.
分析:(1)、(2)题,
+
和
,同分母分数相加减,只把分子相加减,分母不变;
(3)
,注意约分;
(4)
5,整数与分数相乘,把整数和分子相乘,然后化成带分数;
(5)2-
,把整数2化成分数再相减;
(6)3÷7,此题除不尽,用分数表示;
(7)、(8)题
、
÷4,除以一个数等于乘这个数的倒数.
点评:此题虽属于直接写得数的题目,但考查了多方面的知识:同分母分数相加减、整数乘分数、倒数的概念、约分等.
![](http://thumb.1010pic.com/pic5/latex/365.png)
![](http://thumb.1010pic.com/pic5/latex/96.png)
![](http://thumb.1010pic.com/pic5/latex/205735.png)
![](http://thumb.1010pic.com/pic5/latex/168.png)
![](http://thumb.1010pic.com/pic5/latex/8106.png)
![](http://thumb.1010pic.com/pic5/latex/13.png)
![](http://thumb.1010pic.com/pic5/latex/182447.png)
![](http://thumb.1010pic.com/pic5/latex/180370.png)
(5)2-
![](http://thumb.1010pic.com/pic5/latex/602.png)
![](http://thumb.1010pic.com/pic5/latex/71961.png)
![](http://thumb.1010pic.com/pic5/latex/1154.png)
![](http://thumb.1010pic.com/pic5/latex/184619.png)
![](http://thumb.1010pic.com/pic5/latex/1205.png)
![](http://thumb.1010pic.com/pic5/latex/216795.png)
![](http://thumb.1010pic.com/pic5/latex/847.png)
分析:(1)、(2)题,
![](http://thumb.1010pic.com/pic5/latex/365.png)
![](http://thumb.1010pic.com/pic5/latex/96.png)
![](http://thumb.1010pic.com/pic5/latex/205735.png)
(3)
![](http://thumb.1010pic.com/pic5/latex/8106.png)
(4)
![](http://thumb.1010pic.com/pic5/latex/182447.png)
(5)2-
![](http://thumb.1010pic.com/pic5/latex/602.png)
(6)3÷7,此题除不尽,用分数表示;
(7)、(8)题
![](http://thumb.1010pic.com/pic5/latex/184619.png)
![](http://thumb.1010pic.com/pic5/latex/4458.png)
点评:此题虽属于直接写得数的题目,但考查了多方面的知识:同分母分数相加减、整数乘分数、倒数的概念、约分等.
![](http://thumb2018.1010pic.com/images/loading.gif)
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