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b) 6¹*6² - 4*7¹ = 6*(2*3)² - 4*7 = 4(6*9 - 7) = 188
c) 3⁴:3³*(-2)² - 2²:(-81)º = 3*4 - 4 = 8
d) 4³:2³*5² - (-5)³ = 2³*5² + 5³ = 5²(2³ + 5) = 25*13 = 325
f) 2³*(-4)² - 2³:(-2)³ = 8*16 + 1 = 129