二次函数y=ax2+bx+c的图象如图所示,则一次函数y=ax+b的图象不经过( )
A:第一象限
B:第二象限
C:第三象限
D:第四象限
—Talking on WeChat .people's way of communicating in the recent few years.
⑴Christmas Day ____ A. March 12th
⑵Tree-planting Day ____ B. October 1st
⑶Teachers' Day ____ C. December 25th
⑷National Day ____ D. September 10th
⑸New Year's Day ____ E. January 1st
下列国家中,经济最发达的是
已知圆的方程为x2+y2﹣8x+15=0,若直线y=kx+2上至少存在一点,使得以该点为圆心,半径为1的圆与圆C有公共点,则k的最小值是( )