I know that in Python, you can do:

    >>> import fractions
    >>> from fractions import Fraction as F
    >>> F(3, 17) * F(12, 5) + F(56, 99)
    Fraction(8324, 8415)
    >>> F(3, 17) * F(12, 5) + F(56, 99) / 3 + 2 * 4
    Fraction(217412, 25245)

However, if you use a float or a complex with it, the fraction get resolved:

    >>> F(217412, 25245) + 0.1
    8.712081600316894
    >>> F(217412, 25245) + 1j
    (8.612081600316895+1j)

You also have some constants:

    >>> import math
    >>> math.pi
    3.141592653589793
    >>> math.e
    2.718281828459045

But they are not just symbol, there is a precision-limited value behind it. Although the value seems to match the precision NASA considers to be enough for trajectories of spacecrafts like Voyager: https://www.jpl.nasa.gov/edu/news/2016/3/16/how-many-decimal...