①x^n+1*x^n-1 ②[(x+1/2y)^2+(x-1/2y)^2](2x^2-1/2y^2) ③(a-b)^2n+2+(a-b)^2n 因式分解
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x^(n)*x^(n+1)+x^(2n)*x
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x(n+1)
x(n+1)
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