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anh tao bảo bài tin làm thế này
( a+b>c and abs(a-b)<c ) or (b+c>a and abs (b-c)<a ) or (c+a>b and abs (c-a)<b)
thì ko cần thứ tự a>=b>=c
Program Trianglechecker;
Var a,b,c:real;
Begin
Writeln('*** Triangle Side Checker ***');
Writeln('Completed by quantum 12/11/07');
Writeln('Lan luot nhap vao 3 chieu dai cung don vi can kiem tra!');
Readln(a,b,c);
If ((a+b)<=c) or (abs(a-b)>=c) Then
Writeln('Day khong phai ba canh cua tam giac');
Else
Begin {*}
Write('Tam giac ');
If (a=b) and (b=c) Then Writeln('deu.');
Else
Begin {**}
If (abs(a*a-b*b)=c*c) or ((a*a+b*b)=c*c) Then Write('vuong ');
If (a=b) or (b=c) or (a=c) then writeln('can.');
Else
Begin {**}
If (abs(a*a-b*b)>c*c) or (c*c>(a*a+b*b))
Then Writeln('tu.')
Else Writeln('nhon.');
End {***}
End {**}
End {*}
Writeln('Triangle Side Checker Version 1.0 by quantum at 06-09 Hanoi-Amsterdam');
Readln();
End.
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