Question

已知x的平方 x-1＝0求x倍的1-1-x分之2除以x 1-x平方-2x 1分之x的平方-1

Answer 1

x[1-2/(1-x)]/(x+1)-x(x²-1)/(x²-2x+1)

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

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

=-(x²+x-1)/(x-1)

=0