化简：{(x3-1)／(x2+x+1)}+{(x3+1)／(x+1)}-{(x3-x)／(x-1)}
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化简：{(x3-1)／(x2+x+1)}+{(x3+1)／(x+1)}-{(x3-x)／(x-1)}化简：{(x3-1)／(x2+x+1)}+{(x3+1)／(x+1)}-{(x3-x)／(x-1)}
化简：{(x3-1)／(x2+x+1)}+{(x3+1)／(x+1)}-{(x3-x)／(x-1)}
化简：{(x3-1)／(x2+x+1)}+{(x3+1)／(x+1)}-{(x3-x)／(x-1)}
化简：{(x3-1)／(x2+x+1)}+{(x3+1)／(x+1)}-{(x3-x)／(x-1)}
原式=(x-1)(x²+x+1)/(x²+x+1)+(x+1)(x²-x+1)/(x+1)-x(x+1)(x-1)/(x-1)
=(x-1)+(x²-x+1)-(x²+x)
=x-1+x²-x+1-x²-x
=-x
不好意思，看错了，下面是对的
因式分解（1+x+x2+x3)2-x3
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