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(3) exponente -4 = (1/3) exponente 4
(1/2) exponente -7 = (2) exponente 7
(-3/b) exponente - 2 = (b/-3) exponente 2
(-c/d) exponente -5 = (d/-c) exponente 5
(-13/15) exponente -2 = (15/-13) exponente 2