题目内容
计算,能简算可以简算.
235-135÷18
×153-0.6×53
(
+
)÷
+
10-
-
+
.
解:(1)235-135÷18,
=235-7.5,
=227.5;
(2)
×153-0.6×53,
=0.6×153-0.6×53,
=0.6×(153-53),
=0.6×100,
=60;
(3)(
+
)÷
+
,
=
×
+
,
=![](http://thumb.1010pic.com/pic5/latex/3662.png)
,
=
;
(4)10-
-
+
,
=10-(
+
)+
,
=10-1+
,
=9
.
分析:(1)先算除法,再算减法;
(2)把分数化成小数,再运用乘法分配律简算;
(3)先算小括号里面的加法,再算括号外的除法,最后算括号外的加法;
(4)根据连续减去两个数等于减去这两个数的和简算.
点评:此题是考查四则混合运算,要仔细观察算式的特点,灵活运用一些定律进行简便计算.
=235-7.5,
=227.5;
(2)
![](http://thumb.1010pic.com/pic5/latex/14.png)
=0.6×153-0.6×53,
=0.6×(153-53),
=0.6×100,
=60;
(3)(
![](http://thumb.1010pic.com/pic5/latex/602.png)
![](http://thumb.1010pic.com/pic5/latex/96.png)
![](http://thumb.1010pic.com/pic5/latex/317.png)
![](http://thumb.1010pic.com/pic5/latex/3724.png)
=
![](http://thumb.1010pic.com/pic5/latex/41771.png)
![](http://thumb.1010pic.com/pic5/latex/1154.png)
![](http://thumb.1010pic.com/pic5/latex/3724.png)
=
![](http://thumb.1010pic.com/pic5/latex/3662.png)
![](http://thumb.1010pic.com/pic5/latex/470166.png)
=
![](http://thumb.1010pic.com/pic5/latex/10142.png)
(4)10-
![](http://thumb.1010pic.com/pic5/latex/25611.png)
![](http://thumb.1010pic.com/pic5/latex/169788.png)
![](http://thumb.1010pic.com/pic5/latex/36783.png)
=10-(
![](http://thumb.1010pic.com/pic5/latex/25611.png)
![](http://thumb.1010pic.com/pic5/latex/169788.png)
![](http://thumb.1010pic.com/pic5/latex/36783.png)
=10-1+
![](http://thumb.1010pic.com/pic5/latex/36783.png)
=9
![](http://thumb.1010pic.com/pic5/latex/36783.png)
分析:(1)先算除法,再算减法;
(2)把分数化成小数,再运用乘法分配律简算;
(3)先算小括号里面的加法,再算括号外的除法,最后算括号外的加法;
(4)根据连续减去两个数等于减去这两个数的和简算.
点评:此题是考查四则混合运算,要仔细观察算式的特点,灵活运用一些定律进行简便计算.
![](http://thumb2018.1010pic.com/images/loading.gif)
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