若(x^m÷x^2n)^3÷(x^2m-1)与2x是同类项,且m+5n=13,求m^2-25n^2
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若(x^m÷x^2n)^3÷(x^2m-1)与2x是同类项,且m+5n=13,求m^2-25n^2
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若m-2n,x
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