5n×25n-1÷(5n-1×25n-1)
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3
the answer is-2500n^+20n+1
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6
5n×25n-1÷[125n^2-30n+1]
5n×25n-1÷[5n-1×25n-1]
5n÷5n-1
5n×25n-1÷[5n-1×25n-1]
5n÷5n-1
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