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b) (81 ÷ 9) + (25 ÷ 25) = 9 + 1 = 10 F
c) 2 - 49 + (56 ÷ 8) = -47 + 7 = -40 F
d) [3 - 1 + 9] + 1 = 12 F
e) (25 ÷ 5) - 27 = -22 F