(-x)^3*2^n-1+x^2n*(-x)^2fgdffdgfhgg

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(-x)^3*2^n-1+x^2n*(-x)^2fgdffdgfhgg(-x)^3*2^n-1+x^2n*(-x)^2fgdffdgfhgg(-x)^3*2^n-1+x^2n*(-x)^2fgdffd

(-x)^3*2^n-1+x^2n*(-x)^2fgdffdgfhgg
(-x)^3*2^n-1+x^2n*(-x)^2
fgdffdgfhgg

(-x)^3*2^n-1+x^2n*(-x)^2fgdffdgfhgg
9(2x+3)^2-4(2x-5)^2=0
[3(2x+3)]^2-[2(2x-5)]^2=0
(6x+9)^2-(4x-10)^2=0
[(6x+9)+(4x-10)][(6x+9)-(4x-10)]=0
(10x-1)(2x+19)=0
x=1/10,x=-19/2 9(2x+3)^2-4(2x-5)^2=0
[3(2x+3)]^2-[2(2x-5)]^2=0
(6x+9)^2-(4x-10)^2=0
[(6x+9)+(4x-10)][(6x+9)-(4x-10)]=0
(10x-1)(2x+19)=0
x=1/10,x=-19/2 9(2x+3)^2-4(2x-5)^2=0
[3(2x+3)]^2-[2(2x-5)]^2=0
(6x+9)^2-(4x-10)^2=0
[(6x+9)+(4x-10)][(6x+9)-(4x-10)]=0
(10x-1)(2x+19)=0
x=1/10,x=-19/2

原式=-x^(3+2n-1)+x^(2n+2)
=-x^(2n+2)+x^(2n+2)
=0