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![](https://rs.olm.vn/images/avt/0.png?1311)
Câu 1:
uses crt;
var st:string;
d,i,dem:integer;
begin
clrscr;
write('Nhap xau:'); readln(st);
d:=length(st);
write('Xau sau khi xoa so la: ');
for i:=1 to d do
if not(st[i] in ['0'..'9']) then write(st[i]);
writeln;
dem:=0;
for i:=1 to d do
if st[i]=#32 then inc(dem);
writeln('Xau co ',dem,' dau cach');
writeln('Do dai cua xau la: ',d);
readln;
end.
Câu 2:
uses crt;
const fi='kq.out';
var st1,st2:string;
f1:text;
begin
clrscr;
write('Nhap xau thu 1:'); readln(st1);
write('Nhap xau thu 2:'); readln(st2);
assign(f1,fi); rewrite(f1);
if length(st2)>length(st1) then writeln(f1,st2)
else writeln(f1,st1);
close(f1);
end.
![](https://rs.olm.vn/images/avt/0.png?1311)
const fi='vao.inp';
fo='ra.out';
var f1,f2:text;
st:string;
i,d:integer;
begin
assign(f1,fi); reset(f1);
assign(f2,fo); rewrite(f2);
readln(f1,st);
d:=length(st);
for i:=1 to d do
if st[i]='a' then delete(st,i,1);
writeln(f2,st);
close(f1);
close(f2);
end.
![](https://rs.olm.vn/images/avt/0.png?1311)
uses crt;
var st:string;
begin
clrscr;
readln(st);
delete(st,3,5);
writeln(st);
readln;
end.
const fi='dl.inp';
fo='dl.out';
var f1,f2:text;
st:string;
i,d:integer;
begin
assign(f1,fi); reset(f1);
assign(f2,fo); rewrite(f2);
readln(f1,st);
d:=length(st);
for i:=2 to d-1 do
write(f2,st[i]);
close(f1);
close(f2);
end.