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a^3/5 × a^-1/2 / a^-2/5
⇒a^(3/5 + (-1/2)) / a^-2/5
⇒a^(3/5-1/2) / a^-2/5
⇒a^(6/10-5/10) / a^-2/5
⇒a^1/10 / a^-2/5
⇒a^(1/10-(-2/5))
⇒a^(1/10+2/5)
⇒a^(1/10+4/10)
⇒a^(5/10)
⇒a^1/2
⇒√a (c)