Câu 1: 

uses crt;

var a:array[1..500]of integer;

i,n,t: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 

  if (a[i]<0) and (a[i] mod 7=0) then t:=t+a[i];

writeln('Tong cac so am chia het cho 7 la: ',t);

readln;

end.

Câu 2: 

uses crt;

var c,a:array[1..10]of integer;

i,kt,j,dem:integer;

begin

clrscr;

for i:=1 to 10 do 

  begin

write('C[',i,']='); readln(c[i]);

end;

dem:=0;

for i:=1 to 10 do 

  if c[i]>1 then 

begin

kt:=0;

for j:=2 to c[i]-1 do 

  if c[i] mod j=0 then kt:=1;

if kt=0 then 

begin

inc(dem);

a[dem]:=c[i];

end;

end;

if dem=0 then writeln('Trong day khong co so nguyen to')

else begin

writeln('Cac so nguyen to trong day la: ');

for i:=1 to dem do

write(a[i]:4);

end;

readln;

end.

Câu 3: 

uses crt;

var d:array[1..200]of integer;

i,k,dem:integer;

begin

clrscr;

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

for i:=1 to k do 

  begin

write('D[',i,']='); readln(d[i]);

end;

dem:=0;

for i:=1 to k do 

  if (a[i] mod 2=0) and (a[i]>=10) then inc(dem);

writeln('So phan tu chan co 2 chu so la: ',dem);

readln;

end.

#include <bits/stdc++.h>

using namespace std;

long long a[1000],i,n,t,dem,s;

int main()

{

cin>>n;

for (i=1; i<=n; i++) cin>>a[i];

t=0;

for (i=1; i<=n; i++)

if (a[i]%2==0) t+=a[i];

cout<<t<<endl;

dem=0;

for (i=1; i<=n; i++)

if (a[i]%5==2) dem++;

cout<<dem<<endl;

s=1;

for (i=1; i<=n; i++)

if (a[i]%7==3) s*=a[i];

cout<<s;

return 0;

}

const fi='dl.pas'

fo='qk.pas'

var f1,f2:text;

i,n,dem,t,dem1,dem2,kt,j:integer;

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

begin

assign(f1,fi); reset(f1);

assign(f2,fo); rewrite(f2);

readln(f1,n);

for i:=1 to n do 

  read(f1,a[i]);

dem:=0;

for i:=1 to n do 

  if (a[i] mod 2<>0) and (a[i] mod 7=0) then inc(dem);

t:=0;

for i:=1 to n do

  if (10<=a[i]) and (a[i]<=30) then t:=t+a[i];

dem1:=0;

for i:=1 to n do 

  if (a[i]<0) and (a[i] mod 2<>0) then inc(dem1);

dem2:=0;

for i:=1 to n do 

  if a[i]>1 then

begin

kt:=0;

for j:=2 to a[i]-1 do 

  if a[i] mod j=0 then kt:=1;

if kt=0 then inc(dem2);

end;

writeln(f2,'So phan tu le chia het cho 7 la: ',dem);

writeln(f2,'Tong cac phan tu thuoc [10,30] la: ',t);

writeln(f2,'So cac phan tu am le la: ',dem1);

writeln(f2,'So phan tu la so nguyen to la: ',dem2);

close(f1);

close(f2);

end.

Câu 1: 

uses crt;

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

i,n:integer;

t:real;

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 

  if a[i] mod 2=0 then t:=t+a[i];

writeln(t:4:2);

readln;

end.

Câu 2: 

uses crt;

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

i,n:integer;

t:real;

begin

clrscr;

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

for i:=1 to n do 

  begin

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

end;

t:=1;

for i:=1 to n do 

  t:=t*a[i];

writeln(t:4:2);

readln;

end.

#include <bits/stdc++.h>

using namespace std;

long long a[100],n,i,t,t1,dem,dem1;

//chuongtrinhcon

bool ktnt(long long x)

{

if (x<=1) return(false);

for (int i=2; i*i<=x; i++)

if (x%i==0) return(false);

return true;

}

//chuongtrinhchinh

int main()

{

cin>>n;

for (i=1; i<=n; i++)

{

cin>>a[i];

}

for (i=1; i<=n; i++) cout<<a[i]<<" ";

cout<<endl;

t=0;

for (i=1; i<=n; i++) if (a[i]%2==0) t=t+a[i];

cout<<t<<endl;

dem=0;

for (i=1; i<=n; i++) if (a[i]%3==0) dem++;

cout<<dem<<" ";

t1=0;

dem1=0;

for (i=1; i<=n; i++)

if (a[i]%2!=0)

{

t1+=a[i];

dem1++;

}

cout<<fixed<<setprecision(2)<<(t1*1.0)/(dem1*1.0)<<endl;

for (i=1; i<=n; i++)

if (ktnt(a[i])==true) cout<<a[i]<<" ";

return 0;

}

program Tinh_Tong_Phan_Tu_Chan;

var
  A: array of Integer;
  N, i, sum: Integer;

begin
  Write('Nhap N: ');
  Readln(N);

  SetLength(A, N);

  // Nhập các phần tử cho mảng A
  for i := 0 to N - 1 do
  begin
    Write('Nhap phan tu thu ', i + 1, ': ');
    Readln(A[i]);
  end;

  // In lên màn hình các phần tử của mảng A
  Write('Cac phan tu cua mang la: ');
  for i := 0 to N - 1 do
  begin
    Write(A[i], ' ');
  end;
  Writeln;

  // Tính tổng các phần tử chẵn của mảng A và thông báo kết quả ra màn hình
  sum := 0;
  for i := 0 to N - 1 do
  begin
    if A[i] mod 2 = 0 then
      sum := sum + A[i];
  end;
  Writeln('Tong cac phan tu chan cua mang la: ', sum);

  Readln;
end.

#include <bits/stdc++.h>

using namespace std;

long long n,i,x;

int main()

{

cin>>n;

long long t=0;

for (i=1; i<=n; i++)

{

cin>>x;

if (x%3==0) t=t+x;

}

cout<<t;

return 0;

}