化(a(a(a)^(1/2))^(1/2))^(1/2)为分数指数幂
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化(a(a(a)^(1/2))^(1/2))^(1/2)为分数指数幂
化(a(a(a)^(1/2))^(1/2))^(1/2)为分数指数幂
化(a(a(a)^(1/2))^(1/2))^(1/2)为分数指数幂
=a^1/2[1+1/2(1+1/2)]
=a^(7/8)