直接写出结果:①
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103000638849534957/SYS201311030006388495349007_ST/0.png)
=
;②
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103000638849534957/SYS201311030006388495349007_ST/1.png)
=
.
考点分析:
相关试题推荐
兴趣小组的同学要测量树的高度.在阳光下,一名同学测得一根长为1米的竹竿的影长为0.4米,同时另一名同学测量树的高度时,发现树的影子不全落在地面上,有一部分落在教学楼的第一级台阶上,测得此影子长为0.2米,一级台阶高为0.3米,如图所示,若此时落在地面上的影长为4.4米,则树高为( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103000638849534957/SYS201311030006388495349006_ST/images0.png)
A.11.5米
B.11.75米
C.11.8米
D.12.25米
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在比例尺是1:8000的南京市城区地图上,太平南路的长度约为25cm,它的实际长度约为( )
A.320cm
B.320m
C.2000cm
D.2000m
查看答案
已知
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103000638849534957/SYS201311030006388495349004_ST/0.png)
,则
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103000638849534957/SYS201311030006388495349004_ST/1.png)
的值为( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103000638849534957/SYS201311030006388495349004_ST/2.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103000638849534957/SYS201311030006388495349004_ST/3.png)
C.3
D.-3
查看答案
两个相似菱形边长的比是1:4,那么它们的面积比是( )
A.1:2
B.1:4
C.1:8
D.1:16
查看答案
下列计算正确的是( )
A.2
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103000638849534957/SYS201311030006388495349002_ST/0.png)
+4
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103000638849534957/SYS201311030006388495349002_ST/1.png)
=6
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103000638849534957/SYS201311030006388495349002_ST/2.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103000638849534957/SYS201311030006388495349002_ST/3.png)
=4
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103000638849534957/SYS201311030006388495349002_ST/4.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103000638849534957/SYS201311030006388495349002_ST/5.png)
÷
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103000638849534957/SYS201311030006388495349002_ST/6.png)
=3
D.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103000638849534957/SYS201311030006388495349002_ST/7.png)
=-3
查看答案