满分5 >
初中数学试题 >
把长为8cm的矩形按虚线对折,按图中的虚线剪出一个直角梯形,打开得到一个等腰梯形...
把长为8cm的矩形按虚线对折,按图中的虚线剪出一个直角梯形,打开得到一个等腰梯形,剪掉部分的面积为6cm
2,则打开后梯形的周长是( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022160557054650203/SYS201310221605570546502005_ST/images0.png)
A.(10+2
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022160557054650203/SYS201310221605570546502005_ST/0.png)
)cm
B.(10+
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022160557054650203/SYS201310221605570546502005_ST/1.png)
)cm
C.22cm
D.18cm
考点分析:
相关试题推荐
已知反比例函数
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022160557054650203/SYS201310221605570546502004_ST/0.png)
的图象如图,则一元二次方程x
2-(2k-1)x+k
2-1=0根的情况是( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022160557054650203/SYS201310221605570546502004_ST/images1.png)
A.有两个不等实根
B.有两个相等实根
C.没有实根
D.无法确定
查看答案
如图,现有一圆心角为90°,半径为8cm的扇形纸片,用它恰好围成一个圆锥的侧面(接缝忽略不计),则该圆锥底面圆的半径为( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022160557054650203/SYS201310221605570546502003_ST/images0.png)
A.4cm
B.3cm
C.2cm
D.1cm
查看答案
将二次函数y=x
2的图象向右平移1个单位,再向上平移2个单位后,所得图象的函数表达式是( )
A.y=(x-1)
2+2
B.y=(x+1)
2+2
C.y=(x-1)
2-2
D.y=(x+1)
2-2
查看答案
下列图形中,既是轴对称图形又是中心对称图形的是( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022160557054650203/SYS201310221605570546502001_ST/images0.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022160557054650203/SYS201310221605570546502001_ST/images1.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022160557054650203/SYS201310221605570546502001_ST/images2.png)
D.
查看答案