二次函数y=-x²+4x+5的顶点坐标,如果抛物线y=a(x+h)²+k,经过原点,顶点在第二象限,那么a ___0h _____0,K ___0(填<,=)抛物线经过点(0,0)(2,0)(1,1),那么a= _______,b= __________,c= _____
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![二次函数y=-x²+4x+5的顶点坐标,如果抛物线y=a(x+h)²+k,经过原点,顶点在第二象限,那么a ___0h _____0,K ___0(填<,=)抛物线经过点(0,0)(2,0)(1,1),那么a= _______,b= __________,c= _____](/uploads/image/z/3172664-56-4.jpg?t=%E4%BA%8C%E6%AC%A1%E5%87%BD%E6%95%B0y%3D-x%26%23178%3B%2B4x%2B5%E7%9A%84%E9%A1%B6%E7%82%B9%E5%9D%90%E6%A0%87%2C%E5%A6%82%E6%9E%9C%E6%8A%9B%E7%89%A9%E7%BA%BFy%3Da%EF%BC%88x%2Bh%EF%BC%89%26%23178%3B%2Bk%EF%BC%8C%E7%BB%8F%E8%BF%87%E5%8E%9F%E7%82%B9%EF%BC%8C%E9%A1%B6%E7%82%B9%E5%9C%A8%E7%AC%AC%E4%BA%8C%E8%B1%A1%E9%99%90%EF%BC%8C%E9%82%A3%E4%B9%88a+___0h+_____0%2CK+___0%28%E5%A1%AB%EF%BC%9C%EF%BC%8C%EF%BC%9D%EF%BC%89%E6%8A%9B%E7%89%A9%E7%BA%BF%E7%BB%8F%E8%BF%87%E7%82%B9%EF%BC%880%2C0%EF%BC%89%EF%BC%882%2C0%EF%BC%89%EF%BC%881%2C1%EF%BC%89%EF%BC%8C%E9%82%A3%E4%B9%88a%3D+_______%2Cb%3D+__________%2Cc%3D+_____)
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二次函数y=-x²+4x+5的顶点坐标,如果抛物线y=a(x+h)²+k,经过原点,顶点在第二象限,那么a ___0h _____0,K ___0(填<,=)抛物线经过点(0,0)(2,0)(1,1),那么a= _______,b= __________,c= _____
二次函数y=-x²+4x+5的顶点坐标,
如果抛物线y=a(x+h)²+k,经过原点,顶点在第二象限,那么a ___0h _____0,K ___0(填<,=)
抛物线经过点(0,0)(2,0)(1,1),那么a= _______,b= __________,c= ________
二次函数y=-x²+4x+5的顶点坐标,如果抛物线y=a(x+h)²+k,经过原点,顶点在第二象限,那么a ___0h _____0,K ___0(填<,=)抛物线经过点(0,0)(2,0)(1,1),那么a= _______,b= __________,c= _____
y=-(x2-4x 4) 9
=-(x-2)∧2 9
所以定点是(2,9)
a0,k>0
a=-1 b=2 c=0
y=-x²+4x+5
=-(x²-4x)+5
=-(x²-4x+4)+4+5
=-(x-2)²+9
顶点坐标(2, 9)