~15X^3+17x^2+x-1
~(15x^3+15X^2)+2x^2+x+1
~15x^2(x+1)+x^2+x+X^2-1
~15x^2(x+1)+x(x+1)+(x+1)(x-1)
~(x+1)(15x^2+2x-1)
~(x+1)(3x+1)(5x-1)
~x=0~x=-1~x=-1/3~x=1/5
~15X^3+17x^2+x-1
~(15x^3+15X^2)+2x^2+x+1
~15x^2(x+1)+x^2+x+X^2-1
~15x^2(x+1)+x(x+1)+(x+1)(x-1)
~(x+1)(15x^2+2x-1)
~(x+1)(3x+1)(5x-1)
~x=0~x=-1~x=-1/3~x=1/5
•
有多項式的豎式除法吧,和大數的豎式除法差不多
-加應子-
♀
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07/29/2017 postreply
03:26:37
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