若n为正整数,且a^2n=5,(3a^3n)^2-44(a^2)^2n
急
人气:147 ℃ 时间:2020-08-29 12:17:51
解答
(3a^3n)^2-44(a^2)^2n
=9a^6n-44a^4n
=9(a^2n)^3-44(a^2n)^2
=9*5^3-44*5^2
=9*5*25-44*25
=45*25-44*25
=25*(45-44)
=25
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