mọi người giúp em giải bài này vs ạ

#include <bits/stdc++.h>
using namespace std;
double a,b,c,s,p;
int main()
{
    //freopen("DTTAMGIAC.inp","r",stdin);
    //freopen("DTTAMGIAC.out","w",stdout);
    cin>>a>>b>>c;
    p=(a+b+c)/2;
    s=sqrt(p*(p-a)*(p-b)*(p-c));
cout<<fixed<<setprecision(5)<<p*2<<endl;    

cout<<fixed<<setprecision(5)<<s;
    return 0;
}

uses crt;

var a,b,c,p,s,am,bn,cp:real;

begin

clrscr;

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

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

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

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

writeln('Dien tich tam giac la: ',s:4:2);

am:=sqrt(2*(sqr(b)+sqr(c))-sqr(a))/4;

bn:=sqrt(2*(sqr(a)+sqr(c))-sqr(b))/4;

cp:=sqrt(2*(sqr(a)+sqr(b))-sqr(c))/4;

writeln('Do dai duong trung tuyen ung voi canh a la: ',am:4:2);

writeln('Do dai duong trung tuyen ung voi canh b la: ',bn:4:2);

writeln('Do dai duong trung tuyen ung voi canh c la: ',cp:4:2);

end

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

readln;

end.

2: 

#include <bits/stdc++.h>

using namespace std;

double a,b,c,p,s;

int main()

{

cin>>a>>b>>c;

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

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

cout<<fixed<<setprecision(2)<<s;

return 0;

}

uses crt;

var a:int64;

begin

clrscr;

readln(a);

writeln('Chu vi la:',a*4);

writeln('Dien tich la: ',a*a);

readln;

end.

#include <bits/stdc++.h>

using namespace std;

double p,a,b,c,cv,s;

int main()

{

cin>>a>>b>>c;

cv=a+b+c;

p=cv/2;

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

cout<<fixed<<setprecision(2)<<cv<<endl;

cout<<fixed<<setprecision(2)<<s;

return 0;

}

copy hay đấy nhỉ, muốn bị xóa câu trl à?

uses crt;

var a: integer;

begin clrscr;

Writeln('Nhap vao do dai canh cua tam giac deu: '); readln(a);

Writeln('Chu vi cua tam giac deu do la: ',a*3);

readln;

end.

Program dung;

uses crt;

var s,a,b: real;

begin

clrscr;

write('Nhap a; b : '); readln(a,b);

s:=(a*b)/2;

writeln('Dien tich tam giac vuong la: ',s:1:2);

readln;

end.

#include <bits/stdc++.h>

using namespace std;

double a,b;

int main()

{

cin>>a>>b;

cout<<fixed<<setprecision(2)<<(a*b)/2;

return 0;

}

#include <bits/stdc++.h>

using namespace std;

double a,b;

int main()

{

cin>>a>>b;

cout<<a*b/2;

return 0;

}