: в питоне 3.7 формула x = y + 3 ; при вводе (y) срабатывала арифметическая прогрессия до 21 числа , потом ввести 2 числа , сложить и вывести это число .
дешифровки: Const sh = '_.,'; Var St : String; i : Integer; Function DeCode(S : String; Tabl : String; k : Integer) : String; Var j,n : Integer; Begin For j:=1 to Length(S) do Begin n:=Pos(S[j],sh); If n>0 then Begin n:=n+k; While n>Length(sh) do n:=n-Length(sh); While n<=0 do n:=n+Length(sh); S[j]:=sh[n]; end end; DeCode:=S; end; Begin St:='ЗЫФЙГФШРЦ . ШД'; Writeln(Decode(St,sh,-6)); //For i:=-10 to 10 do Writeln(Decode(St,sh,i)); end.
дешифровки:
Const sh = '_.,';
Var
St : String;
i : Integer;
Function DeCode(S : String; Tabl : String; k : Integer) : String;
Var j,n : Integer;
Begin
For j:=1 to Length(S) do
Begin
n:=Pos(S[j],sh);
If n>0 then
Begin
n:=n+k;
While n>Length(sh) do n:=n-Length(sh);
While n<=0 do n:=n+Length(sh);
S[j]:=sh[n];
end
end;
DeCode:=S;
end;
Begin
St:='ЗЫФЙГФШРЦ . ШД';
Writeln(Decode(St,sh,-6));
//For i:=-10 to 10 do Writeln(Decode(St,sh,i));
end.
x
2
+
y
2
=
16
...
...
...
...
...
...
.
.
(
1
)
x + y = 4 (2)
rearrange (2) to y = 4 - x (could do x = 4 - y )
substitute y = 4 - x into (1)
hence:
x
2
+
(
4
−
x
)
2
=
16
⇒
x
2
+
16
−
8
x
+
x
2
=
16
and
2
x
2
−
8
x
+
16
−
16
=
0
⇒
2
x
2
−
8
x
=
0
factor and solve : 2x(x - 4 ) = 0
⇒
x
=
0
,
x
=
4
substitute these values into y = 4 - x , to find corresponding values of y.
x = 0 : y = 4 - 0 = 4 → (0 , 4)
x = 4 : y = 4 - 4 = 0 → (4 , 0 )
These are the points of intersection with the line x +y = 4 and the circle
x
2
+
y
2
=
16
Answer link
Объяснение: