题目内容
计算下面各题,能简便计算的要简便计算.
+![数学公式](http://thumb.1010pic.com/pic5/latex/5192.png)
-![数学公式](http://thumb.1010pic.com/pic5/latex/168.png)
-![数学公式](http://thumb.1010pic.com/pic5/latex/4458.png)
-
+![数学公式](http://thumb.1010pic.com/pic5/latex/155.png)
-
-![数学公式](http://thumb.1010pic.com/pic5/latex/5886.png)
+
+
+
.
解:(1)
+
,
=
+
,
=
;
(2)
-
,
=
-
,
=
;
(3)
-
,
=
-
,
=
;
(4)
-
+
,
=
-
+
,
=
;
(5)
-
-
,
=
-(
+
),
=
-1,
=
;
(6)
+
+
+
,
=(
+
)+(
+
),
=1+2,
=3.
分析:第(1)(2)(3)(4)题,属于异分母分数加减法计算,需要先通分,再计算;
第(5)题,运用减法的性质简算;
第(6)题,运用加法交换律和结合律简算.
点评:此题考查了分数的加减法计算,以及运用运算定律简算的能力.
![](http://thumb.1010pic.com/pic5/latex/155.png)
![](http://thumb.1010pic.com/pic5/latex/5192.png)
=
![](http://thumb.1010pic.com/pic5/latex/189829.png)
![](http://thumb.1010pic.com/pic5/latex/24011.png)
=
![](http://thumb.1010pic.com/pic5/latex/179100.png)
(2)
![](http://thumb.1010pic.com/pic5/latex/729.png)
![](http://thumb.1010pic.com/pic5/latex/168.png)
=
![](http://thumb.1010pic.com/pic5/latex/729.png)
![](http://thumb.1010pic.com/pic5/latex/42887.png)
=
![](http://thumb.1010pic.com/pic5/latex/3982.png)
(3)
![](http://thumb.1010pic.com/pic5/latex/365.png)
![](http://thumb.1010pic.com/pic5/latex/4458.png)
=
![](http://thumb.1010pic.com/pic5/latex/176189.png)
![](http://thumb.1010pic.com/pic5/latex/157094.png)
=
![](http://thumb.1010pic.com/pic5/latex/2634.png)
(4)
![](http://thumb.1010pic.com/pic5/latex/1231.png)
![](http://thumb.1010pic.com/pic5/latex/4442.png)
![](http://thumb.1010pic.com/pic5/latex/155.png)
=
![](http://thumb.1010pic.com/pic5/latex/426617.png)
![](http://thumb.1010pic.com/pic5/latex/257880.png)
![](http://thumb.1010pic.com/pic5/latex/71548.png)
=
![](http://thumb.1010pic.com/pic5/latex/219122.png)
(5)
![](http://thumb.1010pic.com/pic5/latex/33.png)
![](http://thumb.1010pic.com/pic5/latex/35.png)
![](http://thumb.1010pic.com/pic5/latex/5886.png)
=
![](http://thumb.1010pic.com/pic5/latex/33.png)
![](http://thumb.1010pic.com/pic5/latex/35.png)
![](http://thumb.1010pic.com/pic5/latex/5886.png)
=
![](http://thumb.1010pic.com/pic5/latex/33.png)
=
![](http://thumb.1010pic.com/pic5/latex/13.png)
(6)
![](http://thumb.1010pic.com/pic5/latex/5192.png)
![](http://thumb.1010pic.com/pic5/latex/2919.png)
![](http://thumb.1010pic.com/pic5/latex/597.png)
![](http://thumb.1010pic.com/pic5/latex/335.png)
=(
![](http://thumb.1010pic.com/pic5/latex/5192.png)
![](http://thumb.1010pic.com/pic5/latex/597.png)
![](http://thumb.1010pic.com/pic5/latex/2919.png)
![](http://thumb.1010pic.com/pic5/latex/335.png)
=1+2,
=3.
分析:第(1)(2)(3)(4)题,属于异分母分数加减法计算,需要先通分,再计算;
第(5)题,运用减法的性质简算;
第(6)题,运用加法交换律和结合律简算.
点评:此题考查了分数的加减法计算,以及运用运算定律简算的能力.
![](http://thumb2018.1010pic.com/images/loading.gif)
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