1)(3,65- 2³/₄) : 3+ ¹⁷/₄₀×12= 5,4
3,65- 2³/₄ = 3,65- 2,75 = 0,9
0,9 : 3 = 0,3
¹⁷/₄₀×12 = ¹⁷ˣ¹²/₄₀ = ¹⁷ˣ³/₁₀ = ⁵¹/₁₀ = 5,1
0,3 + 5,1 = 5,4
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2)(9,4+ 1¹⁷/₂₀) : 1⁷/₈+25׳/₈= 15,375
9,4+ 1¹⁷/₂₀ = ⁹⁴/₁₀+ ³⁷/₂₀ = ⁹⁴ˣ²/₂₀+ ³⁷/₂₀ = ¹⁸⁸/₂₀+ ³⁷/₂₀ = ¹⁸⁸⁺³⁷/₂₀ = ²²⁵/₂₀ = ⁴⁵/₄
⁴⁵/₄ : 1⁷/₈ = ⁴⁵/₄ : ¹⁵/₈ = ⁴⁵/₄ × ⁸/₁₅ = ⁴⁵ˣ⁸/₄ₓ₁₅ = ³ˣ²/₁ₓ₁ = ⁶/₁ = 6
25׳/₈ = ²⁵ˣ³/₈ = ⁷⁵/₈ = 9,375
6 + 9,375 = 15,375