【数学】y=-1/2x²-x+4 用配方法确定它的顶点坐标、对称轴y=-1/2x²-x+4用配方法确定它的顶点坐标、对称轴.x取何值时,y随x增大而减小?已知二次函数y=-1/2x²-7x+15/2,若自变量x分别取x1、x2
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![【数学】y=-1/2x²-x+4 用配方法确定它的顶点坐标、对称轴y=-1/2x²-x+4用配方法确定它的顶点坐标、对称轴.x取何值时,y随x增大而减小?已知二次函数y=-1/2x²-7x+15/2,若自变量x分别取x1、x2](/uploads/image/z/14993108-44-8.jpg?t=%E3%80%90%E6%95%B0%E5%AD%A6%E3%80%91y%3D-1%2F2x%26%23178%3B-x%2B4+%E7%94%A8%E9%85%8D%E6%96%B9%E6%B3%95%E7%A1%AE%E5%AE%9A%E5%AE%83%E7%9A%84%E9%A1%B6%E7%82%B9%E5%9D%90%E6%A0%87%E3%80%81%E5%AF%B9%E7%A7%B0%E8%BD%B4y%3D-1%2F2x%26%23178%3B-x%2B4%E7%94%A8%E9%85%8D%E6%96%B9%E6%B3%95%E7%A1%AE%E5%AE%9A%E5%AE%83%E7%9A%84%E9%A1%B6%E7%82%B9%E5%9D%90%E6%A0%87%E3%80%81%E5%AF%B9%E7%A7%B0%E8%BD%B4.x%E5%8F%96%E4%BD%95%E5%80%BC%E6%97%B6%2Cy%E9%9A%8Fx%E5%A2%9E%E5%A4%A7%E8%80%8C%E5%87%8F%E5%B0%8F%3F%E5%B7%B2%E7%9F%A5%E4%BA%8C%E6%AC%A1%E5%87%BD%E6%95%B0y%3D-1%2F2x%26%23178%3B-7x%2B15%2F2%2C%E8%8B%A5%E8%87%AA%E5%8F%98%E9%87%8Fx%E5%88%86%E5%88%AB%E5%8F%96x1%E3%80%81x2)
【数学】y=-1/2x²-x+4 用配方法确定它的顶点坐标、对称轴y=-1/2x²-x+4用配方法确定它的顶点坐标、对称轴.x取何值时,y随x增大而减小?已知二次函数y=-1/2x²-7x+15/2,若自变量x分别取x1、x2
【数学】y=-1/2x²-x+4 用配方法确定它的顶点坐标、对称轴
y=-1/2x²-x+4
用配方法确定它的顶点坐标、对称轴.
x取何值时,y随x增大而减小?
已知二次函数y=-1/2x²-7x+15/2,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的大小关系是?
【数学】y=-1/2x²-x+4 用配方法确定它的顶点坐标、对称轴y=-1/2x²-x+4用配方法确定它的顶点坐标、对称轴.x取何值时,y随x增大而减小?已知二次函数y=-1/2x²-7x+15/2,若自变量x分别取x1、x2
y=-1/2x²-x+4
=-1/2(x²+2x+1)+1/2+4
=-1/2(x+1)²+9/4
∴顶点坐标是(-1.9/4)
对称轴x=-1
当x