Question

这个,解一道分式,(x^2-2x+1)/(x^2-1)+(1)/(x)÷(1)/(x+1)

Answer 1

=[(x-1)^2/(x+1)(x-1)]+(1/x)×(x+1)

=(x-1)/(x+1)+(x+1)/x

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

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

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