经分析,开口向下为y1,开口向上为y
OA=OB,抛物线关于y轴对称,b=0
4/[2(a+1)]=3
a=-1/3
a+1=2/3
B(1,0),D(5,0)
y=2/3*(x-1)(x-5)=2x^2/3-4x+10/3
c=1/3
y1=-x^2/3+1/3
经分析,开口向下为y1,开口向上为y
OA=OB,抛物线关于y轴对称,b=0
4/[2(a+1)]=3
a=-1/3
a+1=2/3
B(1,0),D(5,0)
y=2/3*(x-1)(x-5)=2x^2/3-4x+10/3
c=1/3
y1=-x^2/3+1/3