uses crt;
const n=3;
type mas=array[1..n] of real;
function Summa(v:mas):real;
var i:byte;
s:real;
begin
s:=0;
for i:=1 to n do
s:=s+v[i];
Summa:=s;
end;
var a:array[1..n] of mas;
i,j:byte;
p:real;
begin
clrscr;
writeln('Введите ',n*n,' элементов матрицы:');
for i:=1 to n do
for j:=1 to n do
begin
write('a[',i,',',j,']=');
readln(a[i,j]);
end;
clrscr;
writeln('Матрица:');
for i:=1 to n do
begin
for j:=1 to n do
write(a[i,j]:6:2);
writeln;
end;
writeln;
p:=Summa(a[1])*Summa(a[3]);
write('P=',p:0:2);
readln
end.