1, tell you the analytical formula of one of the functions, and find the quadratic function image through k of * * * *.

2. Give you an analytical formula of quadratic function, first find its intersection and the intersection of quadratic function image and X axis;

3. Translate the first parabola for a certain distance, so that the obtained figure has two intersections with the parabola given in 2, and find the longest line segment between the two intersections, and the abscissa of the fixed point of the line segment is equal.