（x+3y)(x-3y)(x^2+9y^2) 和 （-3）^2n+1+3(-3)^2n
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（x+3y)(x-3y)(x^2+9y^2)和（-3）^2n+1+3(-3)^2n（x+3y)(x-3y)(x^2+9y^2)和（-3）^2n+1+3(-3)^2n（x+3y)(x-3y)(x^2+9
（x+3y)(x-3y)(x^2+9y^2) 和 （-3）^2n+1+3(-3)^2n
（x+3y)(x-3y)(x^2+9y^2) 和 （-3）^2n+1+3(-3)^2n
（x+3y)(x-3y)(x^2+9y^2) 和 （-3）^2n+1+3(-3)^2n
1（x+3y)(x-3y)(x^2+9y^2) =(x^2-9y^2) (x^2+9y^2) =(x^4-81y^4)
（-3）^2n+1+3(-3)^2n
2是不是）（-3）^（2n+1）+3(-3)^2n=（-3）^（2n+1）-（-3）(-3)^2n=
（-3）^(2n+1)-(-3)^（2n+1）=0
（x+3y)(x-3y)(x^2+9y^2)
=(x²-9y²)(x²+9y²)
=x^4-81y^4
（-3）^2n+1+3(-3)^2n
=-3^(2n+1)+3×3^(2n)
=-3^(2n+1)+3^(2n+1)
=0
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