ln(1+x)=∫[1/(1+x)]dx
=∫(1-x+x^2-x^3+……+x^n+……)dx
=x-(x^2/2)+(x^3/3)-(x^4/4)+……+
[(-1)^(n+1)](x^n/n)+……
(1+x)ln(1+x)=x+[(x^2/2)-(x^3/6)+……+
(-1)^n(x^n/n(n-1))+……]
分母是n(n-1)
能不能提高一下score?
ln(1+x)=∫[1/(1+x)]dx
=∫(1-x+x^2-x^3+……+x^n+……)dx
=x-(x^2/2)+(x^3/3)-(x^4/4)+……+
[(-1)^(n+1)](x^n/n)+……
(1+x)ln(1+x)=x+[(x^2/2)-(x^3/6)+……+
(-1)^n(x^n/n(n-1))+……]
分母是n(n-1)
能不能提高一下score?