Question

抛物线y=ax2+bx+c(a≠0)的图像如图,则下列结论:1.abc>0 2.a+b+c=2 3.a>1/2 4.b

Answer 1

(1,2)在抛物线上,2 = a+b+c

2 正确

开口向上,a > 0

顶点横坐标= -b/(2a) = -a,b = 2a > 0

x = 0,y = c < 0

abc < 0