(x-3/x^2+3x+2)*(x^2/x^2-4x+3),(x^2-1/x-1÷x^2-x/x^2-2x+1) 这两道题怎么算

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(x-3/x^2+3x+2)*(x^2/x^2-4x+3),(x^2-1/x-1÷x^2-x/x^2-2x+1) 这两道题怎么算
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(x-3/x^2+3x+2)*(x^2/x^2-4x+3),(x^2-1/x-1÷x^2-x/x^2-2x+1) 这两道题怎么算
(x-3/x^2+3x+2)*(x^2/x^2-4x+3),(x^2-1/x-1÷x^2-x/x^2-2x+1) 这两道题怎么算

(x-3/x^2+3x+2)*(x^2/x^2-4x+3),(x^2-1/x-1÷x^2-x/x^2-2x+1) 这两道题怎么算
(x-3/x^2+3x+2)*(x^2/x^2-4x+3)
=(x-3)/(x+2)(x+1)×x²/(x-3)(x-1)
=x²/(x+2)(x+1)(x-1)
怀疑本题是
(x-3/x^2+3x+2)*(x^2 -1 /x^2-4x+3),
=(x-3)/(x+2)(x+1)×(x+1)(x-1)/(x-3)(x-1)
=1/(x+2)
(x^2-1/x-1÷x^2-x/x^2-2x+1)
=(x+1)(x-1)/(x-1)×(x-1)²/x(x-1)
=(x+1)×(x-1)/x
=(x²-1)/x