kwoberlin 发表于 2011-8-4 12:00
HEI ,WHERE IS YOUR ANSWER???
HI I answer in your another "Tie zhi"
later I FOUND you put the same question twice if I did not make a mistake you saw that I Wrote athat x/(1+x)=x*(1-x+x^2-x^3+x^4)=x_x^2+x^3-x^4+...(-x)^(n-1)+...,
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