x-3／x²-1 ÷ （x-3）（x+1）／x²+2x+1 ＋ 1／x+1
=(x-3)(x+1)²/(x+1)(x-1)（x-3）（x+1）+1／x+1
=x+1／x-1+1／x+1
=(2+1)/(2-1)+1/(2+1)
=3+1/3=10/3