N=2^i
512=2^i
2^9=512
i=9
Ответ: 9 бит
Var a,b: integer;
<span>begin
</span><span> write('a = '); readln(a);
</span><span> write('b = '); readln(b);
</span><span> a:=a+b;
</span><span> b:=a-b;
</span><span> a:=a-b;
</span><span> writeln('a = ',a,' b = ',b);
</span><span>end.
</span>a = 15
<span>b = 20
</span><span>a = 20 b = 15
</span>
-13+3 = -10
-10+3^2 = -10+9 = -1
-1+3^3 = -1+27 = 26
26+3^4 = 26+81 = 107
107+3^5 = 107+243 = 350
350+3^6 = 350+729 = 1079
10-1буква
12-2буква
122-3буква
10-4буква
102-5буква
Ответ:всего пять букв.