=(5/2)^4*a^12*b^4*16/5a^8b^5=(5/2)^4*16/5*(a^12*a^8)*(b^4*b^5)=
=125a^20b^9
=x^2n /x^2n-2=x^2n-2n+2=x^2
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=(5/2)^4*a^12*b^4*16/5a^8b^5=(5/2)^4*16/5*(a^12*a^8)*(b^4*b^5)=
=125a^20b^9
=x^2n /x^2n-2=x^2n-2n+2=x^2