1.

Program Tim_Max; 
Var A:Array[1..255] of Integer; 
i, n, Max: Integer; 
Begin 
Write('Nhap n: '); Readln(n); 
For i := 1 to n do 
Begin 
Write('Nhap phan tu A[',i,'] = '); Readln(A[i]); 
End; 
Max := A[1]; 
For i := 2 to n do if A[i]>Max then Max := A[i]; 
Write('Phan tu lon nhat la :',Max); 
Readln 
End.

2.

Uses Crt;
Type Mang = ARRAY[1..50] Of Integer;
Var A:Mang;
N,i,j,Tam:Integer;
Begin
{Nhập mảng}
Write('Nhap N='); Readln(N);
For i:=1 To N Do
Begin
Write('A[',i,']='); Readln(A[i]);
End;
{Sắp xếp}
For i:=1 To N-1 Do
For j:=i+1 To N Do
If A[i]>A[j] Then
Begin
Tam:=A[i]; A[i]:=A[j]; A[j]:=Tam;
End;
{In kết quả ra màn hình}
Writeln('Ket qua sau khi sap xep:');
For i:=1 To N Do Write(A[i]:5);
Readln;
End.

3.

Uses Crt;
Type Mang = ARRAY[1..50] Of Integer;
Var A:Mang;
N,i,x:Integer;

Function TimKiem(x, N: Integer; A:Mang):Integer;
Var i:Integer;
Begin
I:=1;
While (I <= N) and (X<>A[I]) do I:=I+1; {{{{tại sao lại phải làm như bước này, tại sao lại lấy i đi so sánh với N}}}}
If I <= N Then Timkiem:=I Else Timkiem:=0;
End;

Begin
{Nhập mảng}
Write(‘Nhap N=’); Readln(N);
For i:=1 To N Do
Begin
Write(‘A[‘,i,’]=’); Readln(A[i]);
End;
Write(‘Nhap X=’); Readln(x);
{Kết quả tìm kiếm}
If TimKiem(X,N,A)<>0 Then 
Writeln(‘Vi tri cua X trong mang la:’, TimKiem(X,N,A))
Else Writeln(‘X khong co trong mang.’);
Readln;
End.

câu 1 tham khảo cái này nhé

Uses Crt;

Type Mang = ARRAY[1..50] Of Integer;

Var A:Mang;

    N,i,Max:Integer;

Begin

    Write('Nhap N='); Readln(N);

    For i:=1 To N Do

        Begin

            Write('A[',i,']='); Readln(A[i]);

        End;

    Max:=A[1];

    For i:=2 To N Do

    If Max<A[i] Then Max:=A[i];

    Writeln('Phan tu lon nhat cua mang:', Max);

    Readln;

End.

uses crt;

var a:array[1..50]of int64;

i,n,t,max,min:int64;

begin

clrscr;

readln(n);

for i:=1 to n do 

  readln(a[i]);

max:=a[1];

min:=a[1];

t:=0;

for i:=1 to n do 

begin

if max<a[i] then max:=a[i];

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

t:=t+a[i];

end;

writeln('Tong la: ',t);

writeln('So lon nhat la: ',max);

write('Vi tri la: ');

for i:=1 to n do

if a[i]=max then write(i:4);

writeln;

writeln('So nho nhat la: ',min);

write('Vi tri la: ');

for i:=1 to n do 

if a[i]=min then write(i:4);

readln;

end.

Bài 1: 

uses crt;

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

i,n,kt,max,x,j,tam:integer;

begin

clrscr;

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

for i:=1 to n do 

  begin

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

end;

writeln('Mang ban vua nhap la: ');

for i:=1 to n do 

  write(a[i]:4);

writeln;

for i:=1 to n-1 do 

  for j:=i+1 to n do 

if a[i]>a[j] then 

begin

tam:=a[i];

a[i]:=a[j];

a[j]:=tam;

end;

writeln('Day tang dan la: ');

for i:=1 to n do 

  write(a[i]:4);

writeln;

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

max:=0;

kt:=0;

for i:=1 to n do 

  if (a[i] mod 2=0) and (a[i]<=x) then 

   begin

  if max<a[i] then max:=a[i];

kt:=1;

end;

if kt=0 then writeln('Trong day khong co so le')

else writeln('So chan lon nhat khong vuot qua ',x,' la: ',max);

readln;

end.

#include <bits/stdc++.h>

using namespace std;

int A[500],n,i,dem,dem1;

int main()

{

cin>>n;

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

for (int i=n; i>=1; i--) cout<<A[i]<<" ";

cout<<endl;

dem=0;

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

if (A[i]<10) dem++;

cout<<dem<<endl;

dem1=0;

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

if (A[i]>1)

{

bool kt=true;

for (int j=2; j*j<=A[i]; j++)

if (A[i]%j==0) kt=false;

if (kt==true) dem1++;

}

cout<<dem1;

return 0;

}

cứu em với mn còn 30p cuối thôi

#include <bits/stdc++.h>

using namespace std;

long long a[1000],i,n;

int main()

{

cin>>n;

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

sort(a+1,a+n+1);

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

return 0;

}

Program HOC24;

var a: array[1..50] of integer;

i,n: byte;

t: longint;

begin

write('Nhap N: '); readln(n);

for i:=1 to n do

begin

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

end;

write('Cac phan tu chan trong mang la: ');

for i:=1 to n do

if a[i] mod 2=0 then

begin

write(a[i],' ');

t:=t+a[i];

end;

writeln;

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

readln

end.