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f(x) = 5 x³ - 4x + 2                      Grado 3
f(x) = 4                                       Grado 0
f(x) = -2 x³ + 5 x⁴ - 0,3 x + 1      Grado 4
f(x)  = 3² x  +  4                          Grado 1