Question

x-1分之x+1 除以 -x+1分之(1+x)的平方求大神帮助

Answer 1

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