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2 ⁴/₇ - 5 ²/₃ + ²/₅ - 2 ⁴/₇ - ¹/₃ - ²/₅ = -6½ lub -6 (tam jest 5²/₂ czy 5½)
-1 ²/₃ + ⁵/₈ - 6 + ²/₃ - ¹/₈ - ¹/₂ = -7½
( ( -8 + 2) : 3 ) x (8 - 15) = 14
2⁴/₇-5²/₃ + ²/₅ -2⁴/₇ -¹/₃ -²/₅ =
=- 5 ²/₃- ¹/₃+ ²/₅- ²/₅+2 ⁴/₇ - 2⁴/₇=-7
-1 ²/₃ + ⁵/₈ - 6 + ²/₃ - ¹/₈ - ¹/₂ =
=-1 ²/₃ + ²/₃+ ⁵/₈- ¹/₈ - 6 - ¹/₂ =
=-1+½-6-½=-7
( ( -8 + 2) : 3 ) x (8 - 15) =(-6:3)x(-7)=-2x(-7)=14