Если нужен паскаль:
1.
var
a,b:integer;
begin
readln(a,b);
writeln(a,'+',b,'=',a+b);
writeln(a,'*',b,'=',a*b);
end.
2.
var
n,c,m,h:integer;
begin
readln(n);
m:=n div 60;
c:=n mod 60;
if m>=60 then
begin
h:=m div 60;
m:=m mod 60;
if m<>0 then
if c<>0 then
write(h,'ч ',m,'мин ',c,'с')
else
write(h,'ч ',m,'мин ')
else
if c<>0 then
write(h,'ч ',c,'с')
else
write(h,'ч');
end
else
if m<>0 then
if c<>0 then
write(m,'мин ',c,'с')
else
write(m,'мин ')
else
write(c,'с');
end.
var
i, n: integer;
S : real;
begin
writeln( 'This program compute the sum = 1 + (1/2) + (1/4) + ... + (1/(2*n))');
write('Enter the up limit of Sum, n=: ');
readln(n);
S:=1;
for i:=1 to n do S:=S + (1/(2*i));
writeln('Sum = ', S);
end.