用配方法把二次函数y=-2x²+x-4改为形如y=a(x-h)²+k的形式?
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![用配方法把二次函数y=-2x²+x-4改为形如y=a(x-h)²+k的形式?](/uploads/image/z/7626850-34-0.jpg?t=%E7%94%A8%E9%85%8D%E6%96%B9%E6%B3%95%E6%8A%8A%E4%BA%8C%E6%AC%A1%E5%87%BD%E6%95%B0y%3D-2x%26%23178%3B%2Bx-4%E6%94%B9%E4%B8%BA%E5%BD%A2%E5%A6%82y%3Da%EF%BC%88x-h%EF%BC%89%26%23178%3B%2Bk%E7%9A%84%E5%BD%A2%E5%BC%8F%3F)
用配方法把二次函数y=-2x²+x-4改为形如y=a(x-h)²+k的形式?
用配方法把二次函数y=-2x²+x-4改为形如y=a(x-h)²+k的形式?
用配方法把二次函数y=-2x²+x-4改为形如y=a(x-h)²+k的形式?
y=-2(x²-x/2)-4
=-2(x²-x/2+1/16-1/16)-4
=-2(x²-x/2+1/16)+1/8-4
=-2(x-1/4)²-31/8