二次函数y=1-x+x2的图象的开口方向是______．_爱下问搜题

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问题填空题

二次函数y=1-x+x²的图象的开口方向是______．

答案

∵二次函数y=1-x+x²的二次项系数a=1＞0，

∴抛物线开口向上．

故答案为：向上．

选择题

— May I see your ticket, please? I think you ____ in my seat.
— Oh, sorry. My seat is upstairs.

A. are sitting
B. sit
C. sat
D. have sat

判断题

“NETSTAT”是查看对方NETBEUI的命令。（）