如图,抛物线y=ax²+bx+c(a,b,c是常数,a≠0)的对称轴为y轴,且经过...答:y = ax² + bx 对称轴为y轴: x = -b/(2a) = 0, b = 0 y = ax²x = √a, y = a² = 1/16, a = 1/4 (舍去a = -1/4, 此时抛物线不可能在x轴上方)y = x²/4 P(p, p²/4), 圆P为(x - p)² + (y - p²/4)...
如图,抛物线y=ax²+bx+c与x轴交于A(-1,0)B(3,0)两点,与y轴交于点...答:A(-1,0),B(3,0),C(03)y=ax^2+bx+c c=3,b=2,a=-1 (1),y=-x^2+2x+3 (2)k(OP)=k(AC)=3 OP:y=3x y=x^2+2x+3 3x=-x^2+2x+3 x^2+x-3=0 x=(-1±√13)/2 y=(-3±3√13)/2 P[(-1±√13)/2,(-3±3√13)/2](3)k(BC)=-1 BC:x+y-3=0 ...