(x1 + x2 + x3 + x4) / 4 = 1.4; (x1 + x2 + x3 + x4) = 1.4 * 4 = 5.6;
(y1 + y2 + y3) / 3 = 1.75; (y1 + y2 + y3) = 1.75 * 3 = 5.25;
((x1 + x2 + x3 + x4) + (y1 + y2 + y3)) / 7 = (5.6 + 5.25) / 7 = 10.85 / 7= 1.55;
ответ: 1.55;
(x1 + x2 + x3 + x4) / 4 = 1.4; (x1 + x2 + x3 + x4) = 1.4 * 4 = 5.6;
(y1 + y2 + y3) / 3 = 1.75; (y1 + y2 + y3) = 1.75 * 3 = 5.25;
((x1 + x2 + x3 + x4) + (y1 + y2 + y3)) / 7 = (5.6 + 5.25) / 7 = 10.85 / 7= 1.55;
ответ: 1.55;