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3/4 + (-1) = - 1/4
b) 1,6 × 7/16 - 2,7/ 3³= 8/5 × 7/16 - 27/10 :27=
56/80- 27/10 × 1/27= 56/80 - 1/10= 56/80 - 8/80= 6/10 = 0,6