a = float(input("Nhap a : "))
b = float(input("Nhap b : "))
c = float(input("Nhap c : "))
if a+b>c and a+c>b and b+c>a:
    if a==b or a==c or b==c:
        if a==c==b:
            print("Day la ba canh cua tam giac deu")
        else:
            print("Day la ba canh cua tam giac can")
    elif (a**2)+(b**2)==c**2 or (a**2)+(c**2)==b**2 or (c**2)+(b**2)==a**2:
        print("Day la ba canh cua tam giac vuong")
    else:
        pass
else:
    print("Day khong phai ba canh cua tam giac")

uses crt;
var a, b, c: real;
begin
clrscr;
 writeln('Kiem Tra Tam Giac');
    write('Nhap Ba Canh a, b, c:'); readln(a, b, c);
    if (a+b>c) and (a+c>b) and (b+c>a) then 
    begin
     writeln('Do La Ba Canh Tam Giac');
     if (a * a + b * b = c * c) or (a * a + c * c = b * b) or (b * b + c * c = a * a) then 
      writeln('Tam Giac Vuong')
     else if (a = b) or (a = c) or (b = c) then 
     begin
      if (a = b) and (b = c) then 
       writeln('Tam Giac Deu')
      else 
       writeln('Tam Giac Can');
     end
     else writeln('Tam Giac Thuong');
    end
    else write('Khong Phai Tam Giac');
    readln
end.

Uses crt;

Var a, b, c:real;

Begin

Readln(a);

Readln(b);

Readln(c);

If (a + b > c) or (a + c > b) or (b + c > a) then writeln('tam giác')

Else writeln('Khong phai tam giac');

Readln

End.

Var a,b,c: integer;
begin writeln('nhap ba so duong: ');Readln(a,b,c);
if (a+b>c) and (a+c>b) and (b+c>a) then writeln('3 so nay co the la do dai 3 canh cua 1 tam giac')
else writeln('3 so nay khong the la do dai 3 canh cua 1 tam giac');
End.

uses crt;

const fi='bai1.inp'

var f1:text;

a,b,c,cv,dt,p:real;

begin

clrscr;

assign(f1,fi); rewrite(f1);

write('Nhap a='); readln(a);

write('Nhap b='); readln(b);

write('Nhap c='); readln(c);

if (a>0) and (b>0) and (c>0) and (a+b>c) and (a+c>b) and (b+c>a) then 

begin

cv:=a+b+c;

p:=cv/2;

dt:=sqrt(p*(p-a)*(p-b)*(p-c));

writeln(f1,'Chu vi la: ',cv:4:2);

writeln(f1,'Dien tich la: ',dt:4:2);

end

else writeln(f1,'Day khong la ba canh trong mot tam giac');

close(f1);

readln;

end.

1.uses crt;

var n,gt:longint;

begin

clrscr;

repeat

write('nhap so n:');readln(n);

until n>0;

gt:=1;

while n>0 do

begin

gt:=gt*n;

n:=n-1;

end;

writeln('giai thua cua n la:',gt);

readln

end.

2. uses crt;

var a,b,c:real;

begin

clrscr;

write('nhap a=');readln(a);

write('nhap b=');readln(b);

write('nhap c=');readln(c);

if (a*a=b*b+c*c) or (b*=c*c+a*a) or (c*c=a*a+b*b) then writeln('khong phai la tam giac vuong');

readln

end.

uses crt;

var a,b,c:integer;

begin

clrscr;

readln(a,b,c);

if (a=b) and (b=c) then write('YES')

else write('NO');

readln;

end.