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b) 8 5/36 - 3 7/9 - 2 1/9 - 1 7/19= 8⁵/₃₆ - (-⁴⁸/₉)-¹⁷/₁₉ = 8⁵/₃₆ + ⁴⁸/₉ - ¹⁷/₁₉ = ²⁹³/₃₆ + ¹⁹²/₃₆ - ¹⁷/₁₉ = ⁴⁸⁵/₃₆ - ¹⁷/₁₉
c)6 ½- [⁵¹/₃ - (4¼ - 3²/₅)]= 6½-[⁵¹/₃ -(⁴⁵/₂₀-⁶⁸/₂₀)]= 6½-[⁵¹/₃ - (-²³/₂₀)] =6½-[⁵¹/₃+ ²³/₂₀] = 6½-[¹⁰²⁰/₆₀ + ⁶⁹⁰/₆₀] = 6½-¹⁷¹⁰/₆₀ = 6,5 - 28,5 = -22
b) 8 5/36 - 3 7/9 - 2 1/9 - 1 7/19= ?
c) 6 1/2 - [ 51/3 - ( 4 1/4- 3 2/5)]= 13/2 - [16/3- (17/4 - 17/5)]= 13/2 -[16/3-(85/20-68/20)] = 13/2-(16/3 - 17/20) = 13/2 - 16/3 - 17/20 = 390/60 - 320/60 - 51/60 = 19/60