（x-x²-1/1-x）·x²-2x+1/x²-x+1求值.（x-x²-1/1-x）·x²-2x+1/x²-x+1

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（x-x²-1/1-x）·x²-2x+1/x²-x+1求值.（x-x²-1/1-x）·x²-2x+1/x²-x+1（x-x²-1/

（x-x²-1/1-x）·x²-2x+1/x²-x+1求值.（x-x²-1/1-x）·x²-2x+1/x²-x+1
（x-x²-1/1-x）·x²-2x+1/x²-x+1
求值.（x-x²-1/1-x）·x²-2x+1/x²-x+1

（x-x²-1/1-x）·x²-2x+1/x²-x+1求值.（x-x²-1/1-x）·x²-2x+1/x²-x+1
（x-x²-1/1-x）·x²-2x+1/x²-x+1
=（x-x²-1/x²-x+1）·x²-2x+1/(1-x)
=-1*(1-x)
=x-1

答案是x-1