1+x+x(x+1)+(x+1)^2+~~+(x+1)^n 过程解释!过程=1+x[1+(x+1)+(x+1)^2+..(x+1)^n]=1+x[(x+1)^(n+1)-1]/(x+1-1)=(x+1)^(n+1)只要解释速度！！！！！！！！！！等比公式是啥

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