TÍNH 111 × 108 + 111 × 96 − 111 × 204. PROBLEM 2. WHAT DIGI...

Bài 1. Tính

111 × 108 + 111 × 96 − 111 × 204.

Problem 2. What digit should we replace * with?

9 ∗ 1 + ∗ 93 + 36 ∗ = 2020