满分5 >
初中数学试题 >
(2003•黄冈)在△ABC中,AB=AC=3,BC=2,则6cosB等于( )...
(2003•黄冈)在△ABC中,AB=AC=3,BC=2,则6cosB等于( )
A.3
B.2
C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021232441953692783/SYS201310212324419536927003_ST/0.png)
D.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021232441953692783/SYS201310212324419536927003_ST/1.png)
考点分析:
相关试题推荐
(2003•昆明)已知:Rt△ABC中,∠C=90°,cosA=
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021232441953692783/SYS201310212324419536927002_ST/0.png)
,AB=15,则AC的长是( )
A.3
B.6
C.9
D.12
查看答案
(2003•烟台)从边长为1的等边三角形内一点分别向三边作垂线,三条垂线段长的和为( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021232441953692783/SYS201310212324419536927001_ST/0.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021232441953692783/SYS201310212324419536927001_ST/1.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021232441953692783/SYS201310212324419536927001_ST/2.png)
D.
查看答案
(2003•重庆)已知,如图,梯形ABCD中,AD∥BC,∠B=45°,∠C=120°,AB=8,则CD的长为( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021232441953692783/SYS201310212324419536927000_ST/images0.png)
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021232441953692783/SYS201310212324419536927000_ST/0.png)
B.4
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021232441953692783/SYS201310212324419536927000_ST/1.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021232441953692783/SYS201310212324419536927000_ST/2.png)
D.4
查看答案
(2010•日照)如图,在等腰直角三角形ABC中,∠C=90°,AC=6,D是AC上一点,若tan∠DBA=
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021232441953414449/SYS201310212324419534144029_ST/0.png)
,则AD的长是( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021232441953414449/SYS201310212324419534144029_ST/images1.png)
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021232441953414449/SYS201310212324419534144029_ST/1.png)
B.2
C.1
D.2
查看答案
(2003•湘潭)用科学记算器计算,下面结果不正确的是( )
A.17
5=1419857
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021232441953414449/SYS201310212324419534144028_ST/0.png)
=4.358898944
C.sin35°=0.573576436
D.若tanα=
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021232441953414449/SYS201310212324419534144028_ST/1.png)
,则α=25°56′50″
查看答案