如果n为正整数,并且x^2n=7,求(3x^3n)^2-13(x^2)^2n的值.

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如果n为正整数,并且x^2n=7,求(3x^3n)^2-13(x^2)^2n的值.如果n为正整数,并且x^2n=7,求(3x^3n)^2-13(x^2)^2n的值.如果n为正整数,并且x^2n=7,求

如果n为正整数,并且x^2n=7,求(3x^3n)^2-13(x^2)^2n的值.
如果n为正整数,并且x^2n=7,求(3x^3n)^2-13(x^2)^2n的值.

如果n为正整数,并且x^2n=7,求(3x^3n)^2-13(x^2)^2n的值.
(3x^3n)^2-13(x^2)^2n
=9x^6n-13x^4n
=9(x^2n)^3-13x^(2n)^2
=9*7^3-13^7^2
=3087-637
=2450

(3x^3n)^2-13(x^2)^2n
=3x^6n-13x^4n
=9(x^2n)³-13(x^2n)²
=9*7³-13*7²
=3087-637
=2500

(3x^3n)^2-13(x^2)^2n
=9x^6n-13x^4n
=9(x^2n)^3-13(x^2n)^2
=9*7^3-13*7^2
=2450

(3x^3n)^2-13(x^2)^2n
=3^2*(x^2n)^3-13(x^2n)^2
=9*7^3-13*7^2
=49*(63-13)
=2450