满分5 >
初中数学试题 >
(2010•嘉兴)若自然数n使得三个数的加法运算“n+(n+1)+(n+2)”产...
(2010•嘉兴)若自然数n使得三个数的加法运算“n+(n+1)+(n+2)”产生进位现象,则称n为“连加进位数”.例如:2不是“连加进位数”,因为2+3+4=9不产生进位现象;4是“连加进位数”,因为4+5+6=15产生进位现象;51是“连加进位数”,因为51+52+63=156产生进位现象.如果从0,1,2,…,99这100个自然数中任取一个数,那么取到“连加进位数”的概率是( )
A.0.88
B.0.89
C.0.90
D.0.91
考点分析:
相关试题推荐
(2010•嘉兴)根据以下对话,可以求得小红所买的笔和笔记本的价格分别是( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021230657535208977/SYS201310212306575352089007_ST/images0.png)
A.0.8元/支,2.6元/本
B.0.8元/支,3.6元/本
C.1.2元/支,2.6元/本
D.1.2元/支,3.6元/本
查看答案
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021230657535208977/SYS201310212306575352089006_ST/images0.png)
(2010•嘉兴)如图,已知AD为△ABC的角平分线,DE∥AB交AC于E,如果
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021230657535208977/SYS201310212306575352089006_ST/0.png)
=
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021230657535208977/SYS201310212306575352089006_ST/1.png)
,那么
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021230657535208977/SYS201310212306575352089006_ST/2.png)
=( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021230657535208977/SYS201310212306575352089006_ST/3.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021230657535208977/SYS201310212306575352089006_ST/4.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021230657535208977/SYS201310212306575352089006_ST/5.png)
D.
查看答案
(2010•嘉兴)李大伯有一片果林,共80棵果树,某日,李大伯开始采摘今年第一批成熟的果子,他随机选取2棵果树共摘得果子,质量分别为(单位:kg):0.28,0.26,0.24,0.23,0.25,0.24,0.26,0.26,0.25,0.23,以此计算,李大伯收获的这批果子的单个质量和总质量分别约为( )
A.0.25kg,200kg
B.2.5kg,100kg
C.0.25kg,100kg
D.2.5kg,200kg
查看答案
(2010•徐州)一个几何体的三视图如图所示,这个几何体是( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021230657535208977/SYS201310212306575352089004_ST/images0.png)
A.棱柱
B.圆柱
C.圆锥
D.球
查看答案
(2010•嘉兴)如图,A、B、C是⊙O上的三点,已知∠O=60°,则∠C=( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131021230657535208977/SYS201310212306575352089003_ST/images0.png)
A.20°
B.25°
C.30°
D.45°
查看答案