A:(3,3)
B:(3,﹣3)
C:(6,﹣6)
D:(3,3)或(6,﹣6)
补全下面的对话。
A.Size 8,please.
B.These shoes are nice.
C.I will take them.
D.How much are they?
E.Here you are.
A:Can I help you?
B:Yes.____Can I try them on?
A:Of course.
B:____
A:OK.____
A:$50.
B:Here is the money.____
B: Trigger must ____ ____ ____ ____with the crime, because he was at home when the crime took place.
关于x的不等式x+ax2+4x+3>0的解为-3<x<-1或x>2,则a的取值为( )