(2,75:3 2/3-2 1/3:1,75)×3 2/21 = 1²⁹/₃₆
1) 2,75:3²/₃ = ²⁷⁵/₁₀₀ : ¹¹/₃ = ⁵⁵/₂₀ × ³/₁₁ = ⁵⁵ˣ³/₂₀ₓ₁₁ = ⁵ˣ³/₂₀ = ¹⁵/₂₀ = ³/₄
2) 2¹/₃ : 1,75 = ⁷/₃ : ¹⁷⁵/₁₀₀ = ⁷/₃ : ⁷/₄ = ⁷/₃ × ⁴/₇ = ⁷ˣ⁴/₃ₓ₇ = ⁴/₃
3) ³/₄ - ⁴/₃ = ³ˣ³/₁₂ - ⁴ˣ⁴/₁₂= ⁹/₁₂ - ¹⁶/₁₂ = - ⁷/₁₂
4) (-⁷/₁₂) × 3²/₂₁ = -⁷/₁₂ × ⁶⁵/₂₁ = - ⁷ˣ⁶⁵/₁₂ₓ₂₁ = - ⁶⁵/₁₂ₓ₃ = - ⁶⁵/₃₆ = 1²⁹/₃₆