x - y = 5 (x больше y))x*y = 48----------системаx = 5+y(5+y)*y = 48y² + 5y - 48 = 0D=25+4*48 = 217y1;2 = (-5+-√217) / 2x1;2 = ( 5+-√217) / 2ПРОВЕРКА: х = (5 + √217) / 2 y = (-5 + √217) / 2x-y = (5 + √217 - (-5 + √217)) / 2 = 10/2 = 5x*y = (5 + √217)*(-5 + √217) / 4 = (217 - 25) / 4 = 192/4 = 48 х = (5 - √217) / 2 y = (-5 - √217) / 2x-y = (5 - √217 - (-5 - √217)) / 2 = 10/2 = 5x*y = (5 - √217)*(-5 - √217) / 4 = -(25 - 217) / 4 = 192/4 = 48