Skip to content / Đến nội dung
ThichHocToan.com

VTMO 2015 — Grade 2 — final Question 5

VTMO · VTMO 2015 — Grade 2 — final

Question 5

Given $5\circledast6=5\times6-(5+6)=19$, find $9\circledast10$.
  1. $61$
  2. $71$
  3. $80$
  4. $81$
  5. $90$