DanZer формулу из Maple юзал? Добавлено

X0 = (x3 * x3 * y2 - y1 * x3 * x3 - y2 * y1 * y1 + x2 * x2 * y1 + x1 * x1 * y3 + y1 * y1 * y3 - y1 * y3 * y3 - y3 * x2 * x2 + y3 * y3 * y2 + y2 * y2 * y1 - y3 * y2 * y2 - y2 * x1 * x1) / (x3 * y2 - y3 * x2 - x1 * y2 + x1 * y3 + y1 * x2 - y1 * x3) / 0.2e1;
Y0 = -(x3 * x3 * x2 - x3 * x2 * x2 - x3 * y2 * y2 + y3 * y3 * x2 - x1 * x1 * x2 + x1 * x1 * x3 + x1 * x2 * x2 + x1 * y2 * y2 - x1 * x3 * x3 - x1 * y3 * y3 - y1 * y1 * x2 + y1 * y1 * x3) / (x3 * y2 - y3 * x2 - x1 * y2 + x1 * y3 + y1 * x2 - y1 * x3) / 0.2e1;