y=1/3X²+3 y=1/3X²-2 y=-1/4(X+2)² y=-1/4(X-1)² y=½y=1/3X²+3y=1/3X²-2y=-1/4(X+2)²y=-1/4(X-1)²y=½(X+2)²-2y=½(X-1)²+2求二次函数三要素开口
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![y=1/3X²+3 y=1/3X²-2 y=-1/4(X+2)² y=-1/4(X-1)² y=½y=1/3X²+3y=1/3X²-2y=-1/4(X+2)²y=-1/4(X-1)²y=½(X+2)²-2y=½(X-1)²+2求二次函数三要素开口](/uploads/image/z/9486276-60-6.jpg?t=y%EF%BC%9D1%2F3X%26%23178%3B%2B3+y%EF%BC%9D1%2F3X%26%23178%3B-2+y%EF%BC%9D%EF%BC%8D1%2F4%EF%BC%88X%2B2%EF%BC%89%26%23178%3B+y%3D-1%2F4%EF%BC%88X-1%EF%BC%89%26%23178%3B+y%3D%26%23189%3By%EF%BC%9D1%2F3X%26%23178%3B%2B3y%EF%BC%9D1%2F3X%26%23178%3B-2y%EF%BC%9D%EF%BC%8D1%2F4%EF%BC%88X%2B2%EF%BC%89%26%23178%3By%3D-1%2F4%EF%BC%88X-1%EF%BC%89%26%23178%3By%3D%26%23189%3B%EF%BC%88X%2B2%EF%BC%89%26%23178%3B-2y%3D%26%23189%3B%EF%BC%88X-1%EF%BC%89%26%23178%3B%2B2%E6%B1%82%E4%BA%8C%E6%AC%A1%E5%87%BD%E6%95%B0%E4%B8%89%E8%A6%81%E7%B4%A0%E5%BC%80%E5%8F%A3)
y=1/3X²+3 y=1/3X²-2 y=-1/4(X+2)² y=-1/4(X-1)² y=½y=1/3X²+3y=1/3X²-2y=-1/4(X+2)²y=-1/4(X-1)²y=½(X+2)²-2y=½(X-1)²+2求二次函数三要素开口
y=1/3X²+3 y=1/3X²-2 y=-1/4(X+2)² y=-1/4(X-1)² y=½
y=1/3X²+3
y=1/3X²-2
y=-1/4(X+2)²
y=-1/4(X-1)²
y=½(X+2)²-2
y=½(X-1)²+2
求二次函数三要素
开口方向
对称轴
顶点
y=1/3X²+3 y=1/3X²-2 y=-1/4(X+2)² y=-1/4(X-1)² y=½y=1/3X²+3y=1/3X²-2y=-1/4(X+2)²y=-1/4(X-1)²y=½(X+2)²-2y=½(X-1)²+2求二次函数三要素开口
向上,x=0,(0,3)
向上,x=0,(0,-2)
向下,x=-2,(-2,0)
向下,x=1,(1,0)
向上,x=-2,(-2,-2)
向上,x=1,(1,2)