已知二次函数y=-x2-7x+,若自变量x分别取x1,x2,x3,且0<x1<x2<x3,则对应的函数值y1,y2,y3的大小关系正确的是 ( )
A.y1>y2>y3 | B.y1<y2<y3 |
C.y2>y3>y1 | D.y2<y3<y1 |
已知二次函数y=-x2-7x+,若自变量x分别取x1,x2,x3,且0<x1<x2<x3,则对应的函数值y1,y2,y3的大小关系正确的是 ( )
A.y1>y2>y3 | B.y1<y2<y3 |
C.y2>y3>y1 | D.y2<y3<y1 |
试题篮
()