挑战习题
1/5单选题
难度:

1.

如图为抛物线y=ax2+bx+c的图象,A,B,C为抛物线与坐标轴的交点,且OA=OC=1,

则下列关系正确的是(  )


A

a+b=-1

B

a-b=-1

C

b<2a

D

ac<0

提示1:
PHA+55Sx5oqb54mp57q/5LiOeei9tOebuOS6pOS6jueCuUPvvIzlsLHlj6/nn6XpgZND54K555qE5Z2Q5qCH77yIMO+8jDHvvInku6Xlj4pB55qE5Z2Q5qCH77yM54S25ZCO5Luj5YWl5Ye95pWw5byP77yM5Y2z5Y+v5b6X5Yiw562U5qGIPC9wPg==
正确答案:Qg==
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