5^a+3- 5^a+2/5^a+1×6- 5^a+1
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35×105×25 =57×(3×2)535(5×2)5×5×5
(∵(ab)m=ambm ∵am.an=am+n)
57×35×2535×55×25×52
57×35×2535×57×25
=1
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