4) 65-246-65-229-65-17.

4) 65 ⋅ 246 - 65 ⋅ 229 - 65 ⋅ 17 = 65 ⋅ (246 - 229 - 17) = 65 ⋅ (246 - 246) = 65 ⋅ 0 = 0

Ответ: 0