program lab2(input,output);
var
i: Integer;
x1, x2, a, b, c: Real;
begin
i := 1;
x1 := 2.6;
x2 := 2.8;
a := 3;
b := 6;
c := (sqr(x1) + sqr(x2) - a) / (x1 + b);
writeln('c = ', c:0:4);
end.
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