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回数は偶数で正、奇数では負ですので、-1です。
(-1/9)^8*(-3)^18 =(-1/3)^2^8*(-3)^18 =(-1/3)^16*(-3)^18 =[-1/3]*(-3)}^16*(-3)^2 =1^16*(-3)^2 =1*9 =9
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