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![](https://rs.olm.vn/images/avt/0.png?1311)
Uses crt;
Var dai,rong:integer;
Procedure Nhap(Var dai:integer;rong:integer);
Begin
Write('Chieu dai: ');readln(dai);
Write('Chieu rong: ');readln(rong);
End;
Procedure Ve(var dai:integer;rong:integer);
var i,j:integer;
Begin
for i:= 1 to dai do write('*');writeln;
For i:= 1 to rong-2 do
Begin
Write('*');
for j:=1 to dai-2 do write(' ');
writeln('*');
end;
for i:= 1 to dai do write('*');
End;
Begin
clrscr;
Nhap(dai,rong);
Ve(dai,rong);
readln;
End.
![](https://rs.olm.vn/images/avt/0.png?1311)
uses crt;
var a,b:integer;
{-----------------chuong-trinh-con-tinh-chu-vi----------------------------------}
function cv(x,y:integer):integer;
begin
cv:=x+y;
end;
{-------------------chuong-trinh-con-tinh-dien-tich-----------------------------}
function dt(x,y:integer):integer;
begin
dt:=x*y;
end;
{-------------------------chuong-trinh-chinh-------------------------}
begin
clrscr;
write('Nhap chieu dai:'); readln(a);
write('Nhap chieu rong:'); readln(b);
writeln('Chu vi la: ',cv(a,b));
writeln('Dien tich la: ',dt(a,b));
readln;
end.
![](https://rs.olm.vn/images/avt/0.png?1311)
a) Program chuvi_duongtron;
b) const pi = 3.14;
c) readln(r);
d) Thiếu End.
![](https://rs.olm.vn/images/avt/0.png?1311)
var s:string;
f1:text;
a:byte;
begin
assign(f1,'c:\ghixau1.txt'); rewrite(f1);
readln(s);
writeln(f1,s);
close(f1);
End.
![](https://rs.olm.vn/images/avt/0.png?1311)
a) Program chuvi_duongtron;
b) const pi = 3.14;
c) write(‘nhap ban kinh r = ‘);
d) Thiếu End.
![](https://rs.olm.vn/images/avt/0.png?1311)
a) uses crt;
b) var dt, r: real;
c) Thiếu Begin
d) dt:= pi*sqr(r);
![](https://rs.olm.vn/images/avt/0.png?1311)
Program HOC24;
var s: string;
i: byte;
begin
write('Nhap xau :'); readln(s);
for i:=1 to length(s) do if s[i]<>'a' then write(s[i]);
readln
end.
uses crt;
var st:string;
i,d:integer;
begin
clrscr;
write('Nhap xau:'); readln(st);
d:=length(st);
for i:=1 to d do
if st[i]='a' then delete(st,i,1);
writeln(st);
readln;
end.
![](https://rs.olm.vn/images/avt/0.png?1311)
uses crt;
var a,b,cv,s:longint;
begin
clrscr;
write('a=');readln(a);
write('b=');readln(b);
cv:=(a+b)*2;
s:=a*b;
writeln('chu vi cua hinh chu nhat do la:',cv);
write('dien tich cua hinh chu nhat do la:',s);
readln;
end.