3. Какие из нижеследующих выражений на языке ПАСКАЛЬ ошибочны надо

ответ: Только выражение b ошибочно.

1)

var

a,b: array [1..100] of integer;

i,j,k,a,b,f: integer;

begin

randomize;

readln(a);

readln(b);

k: =0;

for i: =1 to 20 do

begin

a[i]: =random(135)-45;

f: =0;

for j: =a to b do

if (a[i]=j) and (a[i] mod 7 =0) then f: =1;

if f=0 then

begin

k: =k+1;

b[k]: =a[i];

end;

end;

for i: =1 to k do

writeln(b[i]);

end.

2)

var

a,b: array [1..100] of integer;

i,j,k: integer;

begin

randomize;

readln(k);

j: =0;

for i: =1 to 20 do

begin

a[i]: =random(135)-45;

writeln(a[i]);

for i: =1 to 19 do

begin

if a[i]*a[i+1]> 0 then

begin

j: =j+1;

b[j]: =a[i];

j: =j+1;

b[j]: =k;

end

else

begin

j: =j+1;

b[j]: =a[i];

end;

end;

j: =j+1;

b[j]: =a[20];

for i: =1 to j do

writeln(b[j]);

3)

var

a,b: array [1..20] of integer;

i,j,k1,k2: integer;

begin

randomize;

readln(k1);

readln(k2);

if k1< k2 then

begin

for i: =1 to 20 do

begin

a[i]: =random(135)-45;

writeln(a[i]);

end;

for i: =1 to k1-1 do

b[i]: =a[i];

for i: =k2+1 to 20 do

b[i]: =a[i];

j: =k2;

for i: =k1 to k2 do

begin

b[j]: =a[i];

j: =j-1;

end;

for i: =1 to 20 do

writeln(b[i]);

end;

end.

program yravnenie;

var  a,b,c,d,x1,x2,p,q: real; begin  repeat  write('a= ');   readln(a);   if a=0 then writeln('error: a=0. enter another value');   until a< > 0;   write('b= ');   readln(b);   write('c= ');   readln(c);   p: =b/a;   q: =c/a;   d: =sqr(p/2)-q;   if d> 0 then  begin    writeln('x1 = ',-p/2-sqrt(d): 0: 5);     writeln('x2 = ',-p/2+sqrt(d): 0: 5);   end  else  if d=0 then  writeln('x1 = x2 = ',-p/2: 0: 5)  else  begin    writeln('x1 = ',-p/2: 0: 5,'-i*',sqrt(-d): 0: 5);     writeln('x2 = ',-p/2: 0: 5,'+i*',sqrt(-d): 0: 5);   end;   readln; end.