èo lớp 8 khó thế:v

sao ko tham khảo 

=V lúc trước làm bài này nhưng quên cách làm rồi

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")

Program HOC24;

var a,b,c: integer;

begin

write('Nhap canh thu nhat AB: '); readln(a);

write('Nhap canh thu hai BC: '); readln(b);

write('Nhap canh thu ba CA: '); readln(c);

if a*a+c*c=b*b then write('Tam giac vuong tai A');

if a*a+b*b=c*c then write('Tam giac vuong tai B');

if b*b+c*c=a*a then write('Tam giac vuong tai C');

readln

end.

#include <bits/stdc++.h>

using namespace std;

double a,b,c;

int main()

{

cin>>a>>b>>c;

if (a>0 && b>0 && c>0 && a+b>c && a+c>b && b+c>a) cout<<"YES";

else cout<<"NO";

return 0;

}

var a,b,c,s,p: real;

begin

write('Nhap canh thu nhat: '); readln(a);

write('Nhap canh thu hai: '); readln(b);

write('Nhap canh thu ba: '); readln(c);

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

begin

p:=(a+b+c)/2;

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

writeln('Chu vi tam giac la ',2*p:5:2, '(dvdd)');

writeln('Dien tich tam giac la: ',s:5:2, '(dvdt)');

if (a=b) and (b=c) then writeln('Day con la tam giac deu') else

if (a=b) or (b=c) or (c=a) then writeln('Day la tam giac can') else

if (a*a+b*b=c*c) or (b*b+c*c=a*a) or (c*c+a*a=b*b) then writeln('Day la tam giac vuong') else

writeln('Day la tam giac thuong');

if ((a=b) or (b=c) or (c=a)) and ((a*a+b*b=c*c) or (b*b+c*c=a*a) or (c*c+a*a=b*b)) then writeln('Day la tam giac vuong can')

end

else writeln(a:5:2,',',b:5:2,',',c:5:2,' khong la do dai mot tam giac');

end.

help me !!!!!!

uses crt;

var a,b,c:real;

begin

clrscr;

readln(a,b,c);

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

begin

if (a=b) and (b=c) then write('Day la tam giac deu')

else writeln('Day khong la tam giac deu');

end

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

readln;

end.

uses crt;

var a,b,c:real;

begin

clrscr;

repeat

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

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

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

until (a>0) and (b>0) and (c>0);

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

begin

writeln('La do dai ba canh cua tam giac');

writeln('Chu vi tam giac la: ',a+b+c:4:2);

end

else writeln('Khong phai la do dai 3 canh cua tam giac');

readln;

end.

#include <bits/stdc++.h>

using namespace std;

double a,b,c;

int main()

{

cin>>a>>b>>c;

if (a>0 && b>0 && c>0 && a+b>c && a+c>b &&b+c>a) cout<<"phai";

else cout<<"ko phai";

return 0;

}