Skip to content / Đến nội dung
ThichHocToan.com

SEAMO 2027 - Paper B - SET 09 - Self-study Question 12

SEAMO · SEAMO 2027 - Paper B - SET 09 - Self-study

Question 12

Find the value of $12345654321\times(1+2+3+4+5+6+5+4+3+2+1)$.
  1. $444444^2$
  2. $555555^2$
  3. $666666^2$
  4. $777777^2$
  5. $888888^2$