化简:
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101190154782266407/SYS201311011901547822664009_ST/0.png)
-
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101190154782266407/SYS201311011901547822664009_ST/1.png)
=
.
考点分析:
相关试题推荐
抛物线y=x
2+4x-3的顶点坐标是
.
查看答案
图1是三个直立于水平面上的形状完全相同的几何体(下底面为圆面,单位:cm).将它们拼成如图2的新几何体,则该新几何体的体积为( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101190154782266407/SYS201311011901547822664007_ST/images0.png)
A.48πcm
3B.60πcm
3C.72πcm
3D.84πcm
3
查看答案
已知圆柱的底面半径是4cm,高线长为15cm,则圆柱的侧面积为( )
A.60πcm
2B.120πcm
2C.160πcm
2D.240πcm
2
查看答案
如图,△ABC中,∠C=90°,AC=8cm,AB=10cm,点P由点C出发以每秒2 cm的速度沿线CA向点A运动(不运动至A点),⊙O的圆心在BP上,且⊙O分别与AB、AC相切,当点P运动2秒钟时,⊙O的半径是( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101190154782266407/SYS201311011901547822664005_ST/images0.png)
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101190154782266407/SYS201311011901547822664005_ST/0.png)
cm
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101190154782266407/SYS201311011901547822664005_ST/1.png)
cm
C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101190154782266407/SYS201311011901547822664005_ST/2.png)
cm
D.2cm
查看答案
在等腰梯形ABCD中,AB∥DC,AD=BC=5,DC=7,AB=13,点P从点A出发,以3个单位/s的速度沿AD⇒DC向终点C运动,同时点Q从点B出发,以1个单位/s的速度沿BA向终点A运动.在运动期间,当四边形PQBC为平行四边形时,运动时间为( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101190154782266407/SYS201311011901547822664004_ST/images0.png)
A.3s
B.4s
C.5s
D.6s
查看答案