皮皮学，免费搜题
登录
搜题
【单选题】
已知二次函数 y=- x 2 +x- 1 5 ，当自变量x取m时对应的值大于0，当自变量x分别取m-1、m+1时对应的函数值为y 1 、y 2 ，则y 1 、y 2 必须满足（ ）A.
y 1 ＞0、y 2 ＞0
B.
y 1 ＜0、y 2 ＜0
C.
y 1 ＜0、y 2 ＞0
D.
y 1 ＞0、y 2 ＜0
拍照语音搜题，微信中搜索"皮皮学"使用
参考答案：
参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【简答题】卵巢的周期性变化包括
【简答题】pollution, extremist, refugee, terrorism, famine, minorities, discrimination, , illegal immigrant, human rights 1. When people do not like or trust someone because they are of a diff...
【简答题】卵巢的周期性变化包括
【单选题】How to Be Paied Attention in the First Four Minutes When do people decide whether or not they want to become friends? During their first four minutes together, according to a book by Dr. Leonard Zunin...
A.
In reply. Dr. Zunin would claim that a little practice can help us feel comfortable about changing our social habits
B.
Much of what has been said about strangers also applies to relationships with family members and friends.
C.
In his opinion, success in life depends mainly on how we get along with other people.
D.
Every time you meet someone in a social situation, give him your undivided attention for four minutes.
E.
He keeps looking over the other person's shoulder, as if hoping to find someone more interesting in another part of the room.
F.
He is eager to make friends with everyone. (46)
【简答题】When people do not have jobs._ _ _ mpl _ _ _ _ _ t ___________
【简答题】卵巢的周期性变化包括
相关题目：