2целых13/30-(1цлая1/10+1/5)
2¹³/₃₀-(1¹/₁₀+¹/₅) = 1²/₁₅ 1) 1¹/₁₀+¹/₅ = ¹¹/₁₀+¹/₅ = ¹¹/₁₀+²/₁₀ = ¹¹⁺²/₁₀ = ¹³/₁₀ 2) 2¹³/₃₀ - ¹³/₁₀=⁷³/₃₀ - ¹³/₁₀=⁷³/₃₀-¹³ˣ³/₃₀=⁷³/₃₀-³⁹/₃₀=⁷³⁻³⁹/₃₀=³⁴/₃₀=1⁴/₃₀=1²/₁₅
2 13/30 - (1 1/10 + 1/5) = 73/30 - (11/10 + 2/10) = 73/30 - 13/10 = 73/30 - 39/30 = 34/30 = 17/15 = 1 2/15