化简(x-1)(x+1)(x²+1)-x(x³-1)
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化简(x-1)(x+1)(x²+1)-x(x³-1)
化简(x-1)(x+1)(x²+1)-x(x³-1)
化简(x-1)(x+1)(x²+1)-x(x³-1)
(x-1)(x+1)(x²-1)-x(x³-1)
=(x²-1)(x²+1)-(x的4次方-x)
=x的4次方-1-x的4次方+x
=x-1