Question

(x-1)/(x^2+x)+(x+1)/(x^3+2x^2+1)=1 分母不为0,则x不等于0,

Answer 1

(x-1)/(x^2+x)+(x+1)/(x^3+2x^2+1)=1

分母不为0,则x不等于0,且x不等于-1.

(x-1)/[x(x+1)]+(x+1)/[x(x^2+2x+1)}=1.

(x-1)/[x(x+1)]+(x+1)/[x(x+1)^2]=1.

(x+1)(x-1+1)/[x(x-1)]=1.

x=1.