Initialize a quotient q = a/b of arbitrary precision. a and b are large integers.
import "math/big"
q := new(big.Rat) q.SetString(str)
q := new(big.Rat) q.SetFrac(a, b)
q := big.NewRat(a, b)
import fractions
q = fractions.Fraction(a, b)
q = Rational(a, b)
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