Question

化简分式

Answer 1

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

^是次方的意思

Answer 2

[(x-1)/(x+1)+2x/(x²-1)]÷1/(x²-1)
=[(x-1)²/(x²-1)+2x/(x²-1)]*(x²-1)
=[(x²-2x+1+2x)/(x²-1)]*（x²-1)
=x²-1