Giải phương trình bậc nhất hai ẩn bằng pascal

Thứ ba - 01/10/2013 09:09
Lập trình giải hệ phương trình bậc nhất hai ẩn bằng pascal: aX + bY =c và a1X + b1Y = c1
Program HPT_BAC_NHAT_2_AN;
uses crt;
var a,b,c: real;
    d,e,f: real;
    x,y: real;
    traloi: c-har;
begin
 repeat
 clrscr;
 writeln('Giai he phuong trinh bac nhat 2 an');
 writeln('------------------------------------------------');
 write('nhap he so a= ');readln(a);
 write('nhap he so b= ');readln(b);
 write('nhap he so c= ');readln(c);
 write('nhap he so a1= ');readln(d);
 write('nhap he so b1= ');readln(e);
 write('nhap he so c1= ');readln(f);
 readln;
 if ((a*e)-(d*b))<>0 then
 begin
 x:= ((c*e)-(f*b))/((a*e)-(d*b));
 y:= ((a*f)-(d*c))/((a*e)-(d*b));
 writeln('vay phuong trinh co mot nghiem x=',x,' va y=',y);
 end;
 if ((a*e)-(d*b))=0 then
  begin
  if (((c*e)-(f*b))<>0) or (((a*f)-(d*c))<>0) then
  writeln('he phuong trinh vo nghiem HI!HI!...HI!');
  if (((c*e)-(f*b))= 0) and (((a*f)-(d*c))=0) then
  writeln('he co vo so nghiem x thuoc R va y=(c-ax)/b nghiem cua he la nghiem cua ax+by=c');
  end;
 writeln('ban co muon tiep tuc thuc hien nua khong (Y/N)?');readln(traloi);
 until (traloi='N') or(traloi='n');
 writeln('nhan ENTER de ket thuc chuong trinh');
 readln
end.

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