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b).... = (1/7 * 14)^2 - (10 * 1/5)^5 = 2^2 - 2^5 = 4 - 32 = - 28
c) .... = (35 : (-7))^2 + ((-6) : (-2))^3 = (-5)^2 + 3^3 = 25 + 27 = 52