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")

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 <iostream>
using namespace std;
int main()
{
    int a,b,c,kt;
    cout<<"Nhap a=";
    cin>>a;
    cout<<"Nhap b=";
    cin>>b;
    cout<<"Nhap c=";
    cin>>c;
    if ((a>0) and (b>0) and (c>0) and (a+b>c) and (a+c>b) and (b+c>a))
    {
        kt=0;
        if (a*a==b*b+c*c) kt=1;
        if (b*b==a*a+c*c) kt=1;
        if (c*c==a*a+b*b) kt=1;
        if ((a==b) and ((a<c) or (a>c)) and ((b<c) or (b>c))) kt=2;
        if ((b==c) and ((b<a) or (b>a)) and ((c<a) or (c>a))) kt=2;
        if ((c==a) and ((c<b) or (c>b)) and ((a<b) or (a>b))) kt=2;
        if ((a==c) and (b==c)) kt=3;
        if (kt==2) cout<<"Day la tam giac can";

else cout<<"Day khong la tam giac can";
    }
    else cout<<"Day khong la ba canh trong mot tam giac";
    return 0;
}

uses crt;

var xa,ya,xb,yb,xc,yc:integer;

ab,ac,bc,cv,p,s:real;

begin

clrscr;

write('Nhap toa do diem A:'); readln(xa,ya);

write('Nhap toa do diem B:'); readln(xb,yb);

write('Nhap toa do diem C:'); readln(xc,yc);

ab:=sqrt(sqr(xa-xb)+sqr(ya-yb));

ac:=sqrt(sqr(xa-xc)+sqr(ya-yc));

bc:=sqrt(sqr(xb-xc)+sqr(yb-yc));

if (ab+bc>ac) and (ab+ac>bc) and (ac+bc>ab) then

begin

cv:=ab+bc+ac;

p:=cv/2;

s:=sqrt(p*(p-ab)*(p-ac)*(p-bc));

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

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

kt:=0;

if (ab=ac) and (ab<>bc) and (ac<>bc) then kt:=1;

if (ac=bc) and (ac<>ab) and (bc<>ab) then kt:=1;

if (ab=bc) and (ab<>ac) and (bc<>ac) then kt:=1;

if (ab=ac) and (ac=bc) then kt:=2;

if sqr(ab)=sqr(ac)+sqr(bc) then kt:=3;

if sqr(ac)=sqr(ab)+sqr(bc) then kt:=3;

if sqr(bc)=sqr(ab)+sqr(ac) then kt:=3;

if kt=0 then writeln('Day la tam giac thuong');

if kt=1 then writeln('Day la tam giac can');

if kt=2 then writeln('Day la tam giac deu');

if kt=3 then writeln('Day la tam giac vuong');

end

else writeln('Day khong phai la toa do 3 dinh cua mot tam giac');

readln;

end.

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.