var suma = 5 + 2;
var różnica = 8 - 3;
var iloczyn = 2 * 3;
var iloraz = 10 / 2;
var wynik = 2 * (12 - 5) + 15 / (9 - 6);
var str = "suma (5 + 2) = " + suma + "<br />";
str = str + "różnica (8 - 3) = " + różnica + "<br />";
str = str + "iloczyn (2 * 3) = " + iloczyn + "<br />";
str = str + "iloraz (10 / 2) = " + iloraz + "<br />";
str = str + "wynik (2 * (12 - 5) + 15 / (9 - 6)) = ";
str = str + wynik + "<br />";

var dataDiv = document.getElementById("dataDiv");
dataDiv.innerHTML = str;

