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3-2,2= 0,8
5-0,85=4.15
6-0,85=5.15
7-0.85=6,15
1-0.90= 0.1
5 - ¹⁷/₂₀ = 4 ³/₂₀
6 - ¹⁷/₂₀ = 5 ³/₂₀
7 - ²¹/₂₅ = 6 ⁴/₂₅
1 - ¹³/₁₄ = ¹/₁₄