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Замена переменных -- обычный прием при решении систем уравнений. Вместо переменной z введена переменная t, которая избавляет от дробей и упрощает подстановку в третье уравнение. Это не обязательно. Можно было бы просто подставить в третье уравнение значения x и у, выраженные через z. Тогда результат подстановки потребует преобразований.
Что имелось в виду под словами "сохранить симметрию уравнений". В исходную систему уравнений x, y и z входят похожим образом. Выражая x и y через z, мы нарушаем эту симметрию, выделяя переменную z.
Исходные уравнения симметричны, в том смысле, что они не меняются при одновременной замене (x, y, z) -> (y, z, x) и (a, b, c) -> (b, c, a). То же самое верно для уравнений, выражающих x, y, z через t (они переходят друг в друга). Так что действительно, вводя переменную t, мы восстанавливаем симметрию. Для получения результата это не обязательно, но может упростить выкладки.
После сокращения a^2+b^2+с^2 в правой и левой частях находим корень t = 0. Для второго корня получается уравнение: (b^2-2ab+a^2)*t + 2*b^2-2ab + (c^2-2bc+b^2)*t + 2*c^2-2bc + (a^2-2ac+a^2)*t + 2*b^2-2ac = 0 Приведение подобных членов дает 2(a^2+b^2+c^2-ab-bc-ac)*t + 2(a^2+b^2+c^2-ab-bc-ac)=0, откуда t = -1.
Можно проверить, что 2(a^2+b^2+c^2-ab-bc-ac) = (a+b+c)^2 + a^2+b^2+c^2 >= 0. Равенство этого выражения нулю возможно только при a=b=c=0. Это значит, что другие решения системы не появятся ни при каких a, b, c.
Значит и уравнение (на скрине) должно упрощаться подобным образом, но при раскрытия скобок там получаются какие-то дикие значения. Это выражение получилось путем преобразования первого уравнения основной системы z = -(x + y), а второго к y = (c-b)x/(b-a) и подстановки второго уравнения в третье
z = -(x + y) y = (c-b)x/(b-a) (x+b)^2 + (y+c)^2 + (z+a)^2 = a^2 + b^2 + c^2
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