arredondamento de numeros javascript
// Retorna o valor 20
x = Math.round(20.49);
// Retorna o valor 21
x = Math.round(20.5);
// Retorna o valor -20
x = Math.round(-20.5);
// Retorna o valor -21
x = Math.round(-20.51);
// Retorna 1 (!)
// Note o erro de arredondamento por causa da inacurácia de aritmética de ponto flutuante
// Compare o exemplo abaixo com Math.round10(1.005, -2)
x = Math.round(1.005*100)/100;
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