51/3*2 1/4-(1 2/15+5/9): 2 1/9 решите

5¹/₃×2¹/₄-(1²/₁₅+⁵/₉):2¹/₉ = 11,2
5¹/₃×2¹/₄ = ¹⁶/₃×⁹/₄ = ¹⁶ˣ⁹/₃ₓ₄ = ¹⁶ˣ⁹/₃ₓ₄ = ¹²/₁ = 12
1²/₁₅+⁵/₉ = ¹⁷/₁₅+⁵/₉ = ¹⁷ˣ³/₄₅+⁵ˣ⁵/₄₅ = ⁵¹/₄₅+²⁵/₄₅ = ⁵¹⁺²⁵/₄₅ = ⁷⁶/₄₅ 
⁷⁶/₄₅ : 2¹/₉ =  ⁷⁶/₄₅ : ¹⁹/₉ =   ⁷⁶/₄₅ × ⁹/₁₉ =  ⁷⁶ˣ⁹/₄₅ₓ₁₉ = ⁴/₅
12 - ⁴/₅ = 11¹/₅ = 11,2

16/3•9/4–(17/15+5/9):19/9=12–228/135•9/19=12–12/15=168/15=11,2