满分5 >
初中数学试题 >
(2002•潍坊)(1)已知x+=4,则= . (2)直角三角形ABC中,∠C=...
(2002•潍坊)(1)已知x+
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021232610869131546/SYS201310212326108691315001_ST/0.png)
=4,则
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021232610869131546/SYS201310212326108691315001_ST/1.png)
=
.
(2)直角三角形ABC中,∠C=90°,∠A=42°24′,∠A的平分线AT=14.7cm,用科学记算器求得AC的长为
cm.(结果精确到0.001)
考点分析:
相关试题推荐
(2002•徐州)正三角形的边长为a,则它的面积为
.
查看答案
(2002•重庆)已知:如图在△ABC中,∠A=30°,tanB=
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021232602463421933/SYS201310212326024634219029_ST/0.png)
,BC=
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021232602463421933/SYS201310212326024634219029_ST/1.png)
,则AB的长为
.
查看答案
(2002•无锡)△ABC中,∠A=60°,∠B=70°,则cos∠C=
(结果保留四个有效数字).
查看答案
(2002•贵阳)已知cosA-
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021232602463421933/SYS201310212326024634219027_ST/0.png)
=0,则锐角∠A=
度.
查看答案
(2002•荆州)计算:
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021232602463421933/SYS201310212326024634219026_ST/0.png)
-
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021232602463421933/SYS201310212326024634219026_ST/1.png)
=
.
查看答案