1, goodbye, mom! (Type a mathematical noun)-Denominator.

2. Pentagon (a geometric noun)-semicircle (half of a dollar).

3, two cows are opposite (a mathematical symbol)-braces.

4, Cowherd and Weaver Girl (make a mathematical symbol)-division.

5, the head of state as an accountant (a mathematical term)-statistics.

6, make a clean break (hit a mathematical term)-score.

7. Everyone has their own opinions (mathematical terms)-business.

8, cross-examination (mathematical terms)-coprime.

9. Fifty cents (mathematical term)-semicircle.