题干

如图,抛物线y1=a(x+2)2﹣3与y2=
1
2
(x﹣3)2+1交于点A(1,3),过点A作x轴的平行线,分别交两条抛物线于点B,C.则以下结论:

①无论x取何值,y2的值总是正数;

②a=1;

③当x=0时,y2﹣y1=4;

④2AB=3AC;

其中正确结论是(   )

A:①②

B:②③

C:③④

D:①④

上一题 下一题 0.0难度 选择题 更新时间:2014-12-03 07:07:02

答案(点此获取答案解析)

D

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