câu 1 

program hieu_thuong;

uses crt;

var a,b,h,t:real;

begin

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

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

if a>=b then h:=a-b else h:=b-a;

t:=a/b;

writeln('hieu cua hai so ',a,'',b,' la ',h);

writeln('thuong cua hai so ',a,'',b,' la ',t);

readln;

end.

câu 2

program chuvi_dientich;

uses crt;

var cv,dt,d,r:real;

begin

write('nhap chieu dai d:');readln(d);

write('nhap chieu rong r:');readln(r);

cv:=( d + r ) * 2 ;

dt:= d * r ;

writeln('chu vi thua ruong la : ',cv);

writeln('dien tich thua ruong la : ',dt);

readln;

end.

h,t là sao vậy ạ ?

Var cd,cr,cv,dt:real;

Begin

Write('Chieu dai = ');readln(cd);

Write('Chieu rong = ');readln(cr);

cv:=(cd+cr)*2;

dt:=cd*cr;

Writeln('Chu vi la ',cv:10:2);

Write('Dien tich la ',dt:10:2);

Readln

End.

Câu 1:

uses crt;

var a,b,c,p,s: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

        p:=(a+b+c)/2;

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

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

end

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

readln;

end.

Câu 2: 

uses crt;

var a:array[1..100]of integer;

i,n,t,max,min:integer;

begin

clrscr;

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

for i:=1 to n do 

  begin

write('A[',i,']='); readln(a[i]);

end;

t:=0;

for i:=1 to n do 

  t:=t+a[i];

writeln('Tong cac phan tu trong day la: ',t);

max:=a[1];

min:=a[1];

for i:=1 to n do 

  begin

     if max<a[i] then max:=a[i];

if min>a[i] then min:=a[i];

end;

writeln('Gia tri lon nhat la: ',max);

writeln('Gia tri nho nhat la: ',min);

readln;

end. 

nếu câu b bài 2 được tách riêng thành 1 câu riêng biệt...thì thay thế bắt đầu từ đâu ạ

Câu 1: 

#include <bits/stdc++.h>

using namespace std;

double a,b,c;

int main()

{

cin>>a>>b>>c;

cout<<fixed<<setprecision(2)<<(a+b+c)/3;

return 0;

}

nbbnbnbbnn\(\dfrac{^{ }}{ }\)

a: Input: a

Output: a²

#include <bits/stdc++.h>

using namespace std;

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

int main()

{

cin>>a>>b>>c;

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

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

if (s>50) cout<<"Dien tich tam giac lon hon";

else cout<<"Dien tich tam giac nho hon";

return 0;

}

uses crt;

var a,b:integer;

begin

clrscr;

readln(a,b);

writeln((a+b)*2);

writeln(a*b);

readln;

end.

1:

uses crt;

const fi='ketqua.txt';

var f1:text;

st:string;

i,d:integer;

begin

clrscr;

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

write('Nhap xau:'); readln(st);

d:=length(st);

for i:=1 to d do 

 if st[i]=#32 then delete(st,i,1);

writeln(f1,st);

close(f1);

end.

2:

uses crt;

var a,b,c,d:integer;

{----------chuong-trinh-con-----------------------}

function min(x,y:integer):integer;

begin

if x<y then min:=x

else min:=y;

end;

{---------------chuong-trinh-chinh--------------------}

begin

clrscr;

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

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

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

write('d='); readln(d);

writeln(min(a,min(b,min(c,d))));

readln;

end.