А)3/8+2 1/4 = ³/₈+⁹/₄ =³/₈+⁹ˣ²/₈ = ³⁺¹⁸/₈ = ²¹/₈ = 2⁵/₈
б) 1/4+ 3 1/6 = ¹/₄+ ¹⁹/₆ = ³/₁₂ + ¹⁹ˣ²/₁₂ = ⁴¹/₁₂ = 3⁵/₁₂
в) 5 5/12+3 2/9 = ⁶⁵/₁₂+²⁹/₉ = ⁶⁵ˣ³/₃₆ + ²⁹ˣ⁴/₃₆ = ¹⁹⁵⁺¹¹⁶/₃₆ = ³¹¹/₃₆ = 8²³/₃₆
г)2 4/9+1/6 = ²²/₉+¹/₆ = ²²ˣ²/₁₈ + ¹ˣ³/₁₈ = ⁴⁴⁺³/₁₈ = ⁴⁷/₁₈ = 2¹¹/₁₈
д) 4 3/5+10 1/4 = ²³/₅ + ⁴¹/₄ = ²³ˣ⁴/₂₀ + ⁴¹ˣ⁵/₂₀ = ⁹²⁺²⁰⁵/₂₀ = ²⁹⁷/₂₀=14¹⁷/₂₀ =14,85