(13²/₃ × 2¹/₇ - 12²/₃ × 2¹/₇) : 1¹/₁₄ × 3¹/₃ + ¹/₃ = 7
Решаем в скобках:
1) (13²/₃ × 2¹/₇ - 12²/₃ × 2¹/₇) = 2¹/₇ ×(13²/₃ - 12²/₃) = 2¹/₇×1 = 2¹/₇ = ¹⁵/₇
2) ¹⁵/₇ : 1¹/₁₄ = ¹⁵/₇ : ¹⁵/₁₄ = ¹⁵/₇ × ¹⁴/₁₅ = ¹⁵ˣ¹⁴/₇ₓ₁₅ = ¹⁴/₇ = 2
3) 2 × 3¹/₃ = ²/₁ × ¹⁰/₃ = ²ˣ¹⁰/₃ = ²⁰/₃
4) ²⁰/₃ + ¹/₃ = ²¹/₃ = 7