x²+x-x³/x-1+1化简

x²+x-x³/x-1+1化简

x²+(x-x³)/(x-1)+1
=x²-(x³-x)/(x-1)+1
=x²-[x(x+1)(x-1)]+1
=x²-x(x+1)+1
=x²-x²-x+1
=1-x
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