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Ещё раз добрый вечер!Уважаемые эксперты,прошу вашей помощи! такое задание: 6 Исследовать систему: ax+by=c dx+ey=f 1)на существование единственного решения 2)Проверить, являются ли заданные значения x и y решением системы двух линейных уравнений с двумя неизвестными 3)Проверить, имеет ли система единственное решение, или имеет множество решений или не имеет решений
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28.12.2009, 14:51
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это ответ
Здравствуйте, angel.nero. В приложении код программы. Для определения числа решений использую правило Крамера (ссылка в комментарии в коде программы). Пример окна программы:
Код:
Решение системы уравнений ax + by = c dx + ey = f Введите значение коэффициента a: 2 Введите значение коэффициента b: - Ошибка ввода Введите значение коэффициента b: -3 Введите значение коэффициента c: 7 Введите значение коэффициента d: 6 Введите значение коэффициента e: -9 Введите значение коэффициента f: 12 Решается система уравнений: 2.000000x + -3.000000y = 7.000000 6.000000x + -9.000000y = 12.000000
Введите Ваш вариант решения Значение x: 1 Значение y: 2 Значения x = 1.000000 и y = 2.000000 не являются решениями системы уравнений Количество решений: нет решения
Жалобы на сложность принимать не буду: лучше спрашивайте - объясню, что к чему
Прикрепил файл с исходным кодом программы
Приложение: TYPE solutions = (sSingle, sMultiple, sNone);
{Функция для получения вещественного числа - с проверкой правильности} function GetReal(msg: String): Real; var r: Real; code: Integer; begin repeat Write(msg,' '); {$I-} ReadLn(r); {$I+} code := IOResult; if code <> 0 then WriteLn('Ошибка ввода'); until code = 0; GetReal := r end;
{Функция для проверки решения} function TestSolution(a, b, c, d, e, f, x, y: Real): Boolean; begin TestSolution := (a*x + b*y = c) and (d*x + e*y = f); end;
{Функция для определения числа решений Находим по правилу Крамера http://www.bymath.net/studyguide/alg/sec/alg15.html} function SolutionCount(a, b, c, d, e, f: Real): solutions; var DET: Real; begin DET := (a*e - b*d); if DET <> 0 then SolutionCount := sSingle else begin SolutionCount := sMultiple; {Но именно здесь может получиться, что нет решений. Проблема усложняется тем, что какие-то коэффициенты могту быть равны 0} if (a*f <> c*d) or (b*f <> c*e) then {так записываю отношения, чтобы избежать деления на ноль} SolutionCount := sNone end; end;
VAR a, b, c, d, e, f: Real; x, y: Real; BEGIN WriteLn('Решение системы уравнений'); WriteLn(' ax + by = c'); WriteLn(' dx + ey = f');
a := GetReal('Введите значение коэффициента a:'); b := GetReal('Введите значение коэффициента b:'); c := GetReal('Введите значение коэффициента c:');
d := GetReal('Введите значение коэффициента d:'); e := GetReal('Введите значение коэффициента e:'); f := GetReal('Введите значение коэффициента f:');
WriteLn; WriteLn('Введите Ваш вариант решения'); x := GetReal(' Значение x: '); y := GetReal(' Значение y: ');
WriteLn('Значения x = ',x:10:6,' и y = ',y:10:6); if NOT TestSolution(a, b, c, d, e, f, x, y) then Write(' не'); WriteLn(' являются решениями системы уравнений');
WriteLn('Количество решений: '); Case SolutionCount(a, b, c, d, e, f) of sSingle : WriteLn(' единственное'); sMultiple: WriteLn(' множество решений'); sNone : WriteLn(' нет решения'); end; END.
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