Текст программы (Pascal)
var
a,b,c,d,e:byte;
k:integer;
begin
k:=0;
for a:=1 to 9 do begin
for b:=0 to 9 do
if b<>a then begin
for c:=0 to 9 do
if (c<>a) and (c<>b) then begin
for d:=0 to 9 do
if (d<>a) and (d<>b) and (d<>c) then begin
e:=0;
repeat
if a*c-c*e=a-b+c+d+e then Inc(k);
e:=e+2
until e<9<br> end
end
end
end;
Writeln(k)
end.
Тестовое решение:
190