2:3¹/₅+(3¹/₄-²/₃):3-(2⁵/₁₈-¹⁷/₃₆):⁶⁵/₁₈ = ⁷¹/₇₂
1) 2:3¹/₅= ²/₁ : ¹⁶/₅= ²/₁ × ⁵/₁₆= ²ˣ⁵/₁₆ = ¹ˣ⁵/₈ = ⁵/₈
2) 3¹/₄-²/₃ = ¹³/₄-²/₃ = ¹³ˣ³/₁₂-²ˣ⁴/₁₂ =³⁹/₁₂-⁸/₁₂ = ³⁹⁻⁸/₁₂ = ³¹/₁₂
3) ³¹/₁₂ : 3 = ³¹/₁₂ : ³/₁ = ³¹/₁₂ × ¹/₃ = ³¹ˣ¹/₁₂ₓ₃ = ³¹/₃₆
4) ⁵/₈ + ³¹/₃₆ = ⁹ˣ⁵/₇₂ + ³¹ˣ²/₇₂ = ⁴⁵+⁶²/₇₂ = ¹⁰⁷/₇₂
5) 2⁵/₁₈-¹⁷/₃₆ = ⁴¹/₁₈-¹⁷/₃₆ = ⁴¹ˣ²/₃₆-¹⁷/₃₆ = ⁸²/₃₆-¹⁷/₃₆ = ⁸²⁻¹⁷/₃₆ = ⁶⁵/₃₆
6) ⁶⁵/₃₆ : ⁶⁵/₁₈ = ⁶⁵/₃₆ × ¹⁸/₆₅ = ⁶⁵ˣ¹⁸/₃₆ₓ₆₅ = ¹⁸/₃₆
7) ¹⁰⁷/₇₂ - ¹⁸/₃₆ = ¹⁰⁷/₇₂ - ¹⁸ˣ²/₇₂ = ¹⁰⁷/₇₂ - ³⁶/₇₂ = ¹⁰⁷⁻³⁶/₇₂ = ⁷¹/₇₂