Question

计算或化简：(1+x²-2x+1分之x²-1）÷1/x-1

Answer 1

原式=[1+(x+1)(x-1)/(x-1)²]×(x-1)

=[1+(x+1)/(x-1)]×(x-1)

=1×(x-1)+(x+1)/(x-1)×(x-1)

=x-1+1

=x