The black rat, yellow ox and the ox are in perfect harmony. They will get married and never separate. They will have children for hundreds of years, and they will be rich and prosperous.
The red horse and the yellow sheep are compatible. This type of marriage is not burdensome, and the life will last for a long time, and the descendants will win the most honors.
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Master Ta (寇抠\wei／?: 6 1 4 8,8 6, 7)
(1) The analytical formula of the parabola: due to A (-3, 0) , point B is symmetric about x=-1, so B(1,0), and
C(0,-2), bring in y=ax^2+bx+c to get y=2 /3x^2+4/3x-2.
(2) Make the auxiliary line AP. Obviously AP is equal to BP, because △APB is an isosceles triangle. Therefore, the perimeter of △PBC is equal to AP+PC+CB, and CB is a constant, so as long as AP+PC is the smallest, it is enough. Obviously, the straight-line distance between points A and C is the shortest, so we only need to find the intersection line between AC and the axis of symmetry at x=-1.
The equation of the straight line passing through AC is
y=-2/3 (x+3). When x=-1, y=-4/3.