I won't fill in all those fuckin' forms from QAcadêmico.

fuck_acadêmico

document.getElementById("R_1781").checked = true;
document.getElementById("R_1790").checked = true;
document.getElementById("R_1795").checked = true;
document.getElementById("R_1800").checked = true;
document.getElementById("R_1805").checked = true;
document.getElementById("R_1810").checked = true;
document.getElementById("R_1815").checked = true;
document.getElementsByName("P_593")[0].value = "FUCK THE SYSTEM (╯°□°）╯";
document.getElementsByName("P_594")[0].value = "FUCK THE SYSTEM (╯°□°）╯";
document.getElementsByName("P_595")[0].value = "FUCK THE SYSTEM (╯°□°）╯";
document.getElementById("Enviar").click();

I suggest you to list all the ids and names and map over them to apply a function to do the work.

var ids = [1781, 1790, 1795, 1800, 1805, 1810, 1815];
var names = [593, 594, 595];

var check = function(id) {
  var maybeDOM = document.getElementById("R_" + id.toString());
  maybeDOM && maybeDOM.checked = "checked";
};

var fill = function(id) {
  var maybeDOM = document.getElementsByName("P_" + id.toString());
  maybeDOM[0] && maybeDOM[0].value = "FUCK THE SYSTEM (╯°□°）╯";
};

ids.forEach(check);
names.forEach(fill);