0.25n^2+n+1 1-10x+25x^2 -2x^2n-4x^n

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0.25n^2+n+11-10x+25x^2-2x^2n-4x^n0.25n^2+n+11-10x+25x^2-2x^2n-4x^n0.25n^2+n+11-10x+25x^2-2x^2n-4x^n您

0.25n^2+n+1 1-10x+25x^2 -2x^2n-4x^n
0.25n^2+n+1 1-10x+25x^2 -2x^2n-4x^n

0.25n^2+n+1 1-10x+25x^2 -2x^2n-4x^n
您好:

0.25n^2+n+1
=0.25x(n^2+4n+4)
=0.25(n+2)^2

1-10x+25x^2
=(1-5x)^2

-2x^2n-4x^n
=-2x^n(x^n+2)

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