满分5 >
高中数学试题 >
在△ABC中,A,B,C的对边分别为a,b,c,且则a:b:c为( ) A.1:...
在△ABC中,A,B,C的对边分别为a,b,c,且
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101222837800289981/SYS201311012228378002899000_ST/0.png)
则a:b:c为( )
A.1:
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101222837800289981/SYS201311012228378002899000_ST/1.png)
:2
B.1:1:
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101222837800289981/SYS201311012228378002899000_ST/2.png)
C.1:2:
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101222837800289981/SYS201311012228378002899000_ST/3.png)
D.2:1:
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101222837800289981/SYS201311012228378002899000_ST/4.png)
或1:1:
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101222837800289981/SYS201311012228378002899000_ST/5.png)
考点分析:
相关试题推荐
已知直线l:y=kx-1与圆C:(x-1)
2+y
2=1相交于P、Q两点,点M(0,b)满足MP⊥MQ.
(Ⅰ)当b=0时,求实数k的值;
(Ⅱ)当
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101222837800145549/SYS201311012228378001455020_ST/0.png)
时,求实数k的取值范围.
查看答案
已知三个正数a,b,c满足a<b<c.
(Ⅰ)若a,b,c是从1,2,3,4,5中任取的三个数,求a,b,c能构成三角形三边长的概率;
(Ⅱ)若a,b,c是从区间(0,1)内任取的三个数,求a,b,c能构成三角形三边长的概率.
查看答案
如图所示,正方形ABCD和矩形ACEF所在的平面相互垂直,已知AB=2,
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101222837800145549/SYS201311012228378001455018_ST/0.png)
.
(I)求证:EO⊥平面BDF;
(II)求二面角A-DF-B的大小.
查看答案
用分期付款方式购买家用电器一件,价格为1150元,购买当天先付150元,以后每月这一天还款一次,每次还款数额相同,20个月还清,月利率为1%,按复利计息.若交付150元后的第一个月开始算分期付款的第一个月,全部欠款付清后,请问买这件家电实际付款多少元?每月还款多少元?(最后结果保留4个有效数字)参考数据:(1+1%)
19=1.208,(1+1%)
20=1.220,(1+1%)
21=1.232.
查看答案
(Ⅰ)求证
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101222837800145549/SYS201311012228378001455016_ST/0.png)
;
(Ⅱ)△ABC的三边a,b,c的倒数成等差数列,求证
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101222837800145549/SYS201311012228378001455016_ST/1.png)
.
查看答案