program trung_binh;
uses crt;
var a,t:longint;
begin
clrscr;
t:=0;
write('Nhap muc thu nhap cua gia dinh thu nhat: '); readln(a);
t:=t+a;
write('Nhap muc thu nhap cua gia dinh thu hai: '); readln(a);
t:=t+a;
write('Nhap muc thu nhap cua gia dinh thu ba: '); readln(a);
t:=t+a;
write('Nhap muc thu nhap cua gia dinh thu tu: '); readln(a);
t:=t+a;
write('Nhap muc thu nhap cua gia dinh thu nam: '); readln(a);
t:=t+a;
write('Muc thu nhap trung binh la: ',t/5:0:3);
readln;
end.
Cách 2: Dùng mảng:
program trung_binh;
uses crt;
var A:array[1..5] of longint;
t:longint;
i:byte;
begin
clrscr;
t:=0;
for i:=1 to 5 do
begin
write('Nhap muc thu nhap cua gia dinh thu ',i,': '); readln(A[i]);
t:=t+A[i];
end;
write('Muc thu nhap trung binh la: ',t/5:0:3);
readln;
end.
