6) 22 ⋅ 17 - 18 ⋅ 17 + 17 ⋅ 15 - 15 ⋅ 13 + 18 ⋅ 13 - 14 ⋅ 13 =

Представим выражение в виде:

17 × (22 - 18 + 15) - 13 × (15 - 18 + 14) =

17 × (4 + 15) - 13 × ( -3 + 14) =

17 × 19 - 13 × 11 =

323 - 143 = 180

Ответ: 180