Объясните, , как делать такие (егэ)

x1 x2 x3 x4 x2∧x4 ¬x1 ¬x1∨x3 x2∧x4∧(¬x1∨x3) ¬x2∧x4∧(¬x1∨x3) ¬x1∧x2 ¬x3 ¬x1∧x2∧¬x3 x4∨¬x1∧x2∧¬x3 ¬x2∧x4∧(¬x1∨x3)∧(x4∨¬x1∧x2∧¬x3) x1∧x2 ¬x1∧x2 ¬x2∧x4∧(¬x1∨x3)∧(x4∨¬x1∧x2∧¬x3)∧¬x1∧x2 ¬x2∧x4∧(¬x1∨x3)∧(x4∨¬x1∧x2∧¬x3)∧¬x1∧x2≡1

0 0 0 0 0 1 1 0 1 0 1 0 0 0 0 1 0 0

0 0 0 1 0 1 1 0 1 0 1 0 1 1 0 1 1 1

0 0 1 0 0 1 1 0 1 0 0 0 0 0 0 1 0 0

0 0 1 1 0 1 1 0 1 0 0 0 1 1 0 1 1 1

0 1 0 0 0 1 1 0 1 1 1 1 1 1 0 1 1 1

0 1 0 1 1 1 1 1 0 1 1 1 1 0 0 1 0 0

0 1 1 0 0 1 1 0 1 1 0 0 0 0 0 1 0 0

0 1 1 1 1 1 1 1 0 1 0 0 1 0 0 1 0 0

1 0 0 0 0 0 0 0 1 0 1 0 0 0 0 1 0 0

1 0 0 1 0 0 0 0 1 0 1 0 1 1 0 1 1 1

1 0 1 0 0 0 1 0 1 0 0 0 0 0 0 1 0 0

1 0 1 1 0 0 1 0 1 0 0 0 1 1 0 1 1 1

1 1 0 0 0 0 0 0 1 0 1 0 0 0 1 0 0 0

1 1 0 1 1 0 0 0 1 0 1 0 1 1 1 0 0 0

1 1 1 0 0 0 1 0 1 0 0 0 0 0 1 0 0 0

1 1 1 1 1 0 1 1 0 0 0 0 1 0 1 0 0 0

Объяснение:

вроде так

1.
uses crt;
var n:string;
begin
read(n); 
writeln(strtoint(n[1])*strtoint(n[2])*strtoint(n[3]));
end.
2.
uses crt;
var n,i:integer;
res:double;
begin
read(n);
for i:=1 to n do
res:=res+cos(1/i);
writeln(res:5:3);
end.
3.
uses crt;
var n,i:integer;
mult:real;
a:array[1..100] of real;
begin
mult:=1;
writeln('Input N and elements of array.');
read(n);
for i:=1 to n do
begin
read(a[i]);
if i mod 2=0 then 
mult:=mult*a[i];
end; 
writeln(mult);
end.
4.
uses crt;
var n,i,sum:integer;
a:array[1..100] of integer;
begin
writeln('Input N and elements of array.');
read(n);
for i:=1 to n do
read(a[i]);
i:=1;
while (a[i]<>0) and (i<=n) do
begin
if a[i] mod 2=0 then
sum:=sum+a[i];
i:=i+1;
end;
writeln(sum);
end.