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-5/4+ (-3/2)+ 1/2= -1 1/4- 1 1/2+ 1/2= - 1 1/4- 1 - 1/2+ 1/2= - 1 1/4 -1 = -2 1/4
(1/2• 8/3)- -(1/2• 2/59)= 1/2• (8/3 - (-2/59)= 1/2• (8/3+ 2/59)= 1/2• ( (8•59)/(3•59) + (3•2)/(59•3) ) =1/2• (472/177+ 6/177)= 1/2• 478/177= 1/1• 239/177= 239/177= 1 62/177
(1/2• 8/3)- (- 1/2• 2/59)= (1/1• 4/3)- (- 1/1• 1/59)= 4/3+ 1/59= (4•59)/(3•59)+ (3•1)/(3•59)= 236/177+ 3/177= 239/177= 1 62/177