Workaround: use // instead of / to do division without remainder in the 
ring.

```
sage: R.<c> = QQ[]
sage: S.<x, y> = R[]
sage: u = FractionField(S)(x^2 + y^2)
sage: v = u.numerator()//u.denominator()
sage: print(u.numerator().parent())
Multivariate Polynomial Ring in x, y over Univariate Polynomial Ring in c 
over Rational Field
sage: print(v.numerator().parent())
Multivariate Polynomial Ring in x, y over Univariate Polynomial Ring in c 
over Rational Field
```

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