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b) 6^7 : 6^-2 = 6^7-(-2) = 6^7+2 = 6^9 = 10077696 (tutaj odejmujemy wykładniki potęg ponieważ mamy takie same podstawy )
c) (-1)^-1 = -1
d) (8^2)^-1 = 8^-2 = 1/8^2 = 1/64