A:Who is that girl ?
B:What's her name ?
C:What does he do?
图上1厘米代表实地距离100千米,用数字比例尺表示是( )
如图,在平面直角坐标系中,二次函数y=x2+bx+c的图象与x轴交于A,B两点,与y轴交于点C(0,﹣3),A点的坐标为(﹣1,0).