a)
program ct;
uses crt;
var i,n,s:integer;
A:array[1..100] of integer;
begin
clrscr;
write('nhap n:=');readln(n);
for i:=1 to n do
begin
write('nhap mang A[',i,']:=');readln(A[i]);
end;
s:=0;
for i:=1 to n do
if A[i] mod 5=0 then s:=s+A[i];
writeln('tong cac so chia het cho 5 la:',s);
readln
end.
b)
program ct;
uses crt;
var i,n,T:integer;
A:array[1..100] of integer;
begin
clrscr;
write('nhap n:=');readln(n);
for i:=1 to n do
begin
write('nhap mang A[',i,']:=');readln(A[i]);
end;
T:=1;
for i:=1 to n do
if A[i]>0 then T:=T*A[i];
writeln('tich la:',T);
readln
end.
c)
program ct;
uses crt;
var i,n,s:integer;
A:array[1..100] of integer;
begin
clrscr;
write('nhap n:=');readln(n);
for i:=1 to n do
begin
write('nhap mang A[',i,']:=');readln(A[i]);
end;
s:=0;
for i:=1 to n do
if A[i] mod 2=1 then s:=s+A[i];
writeln('tong cac so le la:',s);
readln
end.
