1) 318 × 78 + 318 × 22 = 318 × (78 + 22) = 318 × 100 = 31800
2) 856 × 92 - 853 × 92 = 92 × (856 - 853) = 92 × 3 = 276
3) 943 × 268 + 943 × 232 = 943 × (268 + 232) = 943 × 500 = 471500
4) 65 × 246 - 65 × 229 - 65 × 17 = 65×(246-229-17) = 65 × 0 = 0
