化简：x²-{x²-[x²-(x²-1)-1]-1}-1

化简：x²-{x²-[x²-(x²-1)-1]-1}-1

x²-{x²-[x²-(x²-1)-1]-1}-1
=x²-[x²-(x²-x²+1-1)-1]-1
=x²-(x²-1)+1
=x²-x²+1+1
=2
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x²-{x²-[x²-(x²-1)-1]-1}-1
=x²-x²+[x²-(x²-1)-1]+1-1
=x²-(x²-1)-1
=x²-x²+1-1
=0