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Здравствуйте, KSIW2S! Задача 3(3). Дробная часть числа x равна разности между x и целой частью [x]. Поэтому из {x} = {y} следует y - [y] = x - [x], или y = x + [y] - [x]. Так как [y] - [x] целое число, то любая пара (x,y), удовлетворяющая уравнению {x} = {y}, удовлетворяет уравнению: y = x + k, при к = 0, [$177$]1, [$177$]2, ... . (1) С другой стороны, {x} = {y} для любой пары (x,y), удовлетворяющей уравнению (1). Следовательно, множество точек, (x,y), таких, что {x} = {y}, включает те и только те точки, которые принадлежат прямым (1).
Небольшое уточнение к Вашему решению задачи. Линейная функция растет быстрее, чем корень, поэтому при a [$8712$] (0, ([$8730$]15 - 2)/22) будет два решения, т.е, ответ должен быть a [$8712$] [-2/11,0], a = ([$8730$]15-2)/22.
К сожалению и в первом моем ответе ошибка: условие списал верно, а решать начал с другим условием ( минус в правой части перед иксом потерял) , переделал, но принцип тот же
Исходное уравнение [$8730$](x - 8) = -ax + 3a + 2. (1) Сделаем замену переменной y = [$8730$](x - 8), y [$8805$]0. Выразим ax через y, используя левую часть: ax = a*(y2 + 8), То же, используя правую часть: ax = -y + 3a +2. Приравнивая эти выражения, получим квадратное уравнение ay2 + y + 5a - 2 = 0, (2) эквивалентное исходному при условии y[$8805$]0. То есть, нас интересуют неотрицательные корни уравнения (2). Если a = 0, корень один, и он положительный. При a [$8800$] 0 уравнение (2) имеет корни: y1,2 = (-1 [$177$][$8730$](-20a2+ 8a +1)/(2a). (3) Если a > 0, уравнение будет иметь единственный неотрицательный корень, если -20a2 + 8a + 1 [$8805$] 1, откуда находим a [$8804$] 2/5. С учетом условия a > 0, а также вспоминая, что при a = 0 уравнение (2) имеет единственный корень, заключаем, что уравнение (2) имеет единственный неотрицательный корень при a [$8712$] [0, 2/5]. Пусть теперь a < 0. Легко убедиться, что неравенство -20a2 + 8a + 1 [$8804$] 1, выполняется при всех отрицательных a, поэтому (см.(3)), при a < 0 положительными будут оба корня y12, и уравнение (2) будет иметь единственное решение только при нулевом дискриминанте, т.е., при -20a2 + 8a + 1 = 0. Решая это уравнение, находим, что его отрицательный корень a=-1/10.
Ответ: a[$8712$][0,2/5], a = -1/10.
Ответ должен совпасть с ответом в первым решении, после исправления ошибки в нем.
Задача 7(5) x2 + y2 + 7 [$8804$] 4(|x| + |y|) (1) x2 + y2 +2y = a2 -1 (2) Для точек I-го квадранта x >0, y>0 и нераветство (1) запишется так: x2 + y2 + 7 [$8804$] 4x + 4y, или (x - 2)2 + (y - 2)2 [$8804$] 1, т.е., оно определяет точки круга с центром (2;2) и радиусом 1. Рассматривая аналогично точки, лежащие в других квадрантах, получим неравенства: (x [$177$] 2)2 + (y [$177$] 2)2 [$8804$] 1, которые определяют четыре круга единичного радиуса с центрами ([$177$]2, [$177$]2). Неравенство (1) выполняется, если точка (x,y) попадет в один из кругов. Уравнение (2) можно переписать в виде x2 + (y+1)2 = a2. Этому уравнению соответствуют точки окружности радиуса |а| с центром (0,-1). Расстояния между центром этой окружности и центрами кругов, определяемых неравенством (1), равны [$8730$](22 +32 ) = [$8730$]13 для кругов, лежащих в квадрантах I, II, и [$8730$](22 +12 ) = [$8730$]5 для кругов, лежащих в квадратах III,IV. Соответственно, система (1), (2) имеет решения при |a| [$8712$] [[$8730$]13-1, [$8730$]13+1] и при |a| [$8712$] [[$8730$]5-1, [$8730$]5+1]. Эти интервалы перекрываются, поэтому окончательно будем иметь: |a| [$8712$] [[$8730$]5-1, [$8730$]13+1].
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