化简 a(a-1)^2-(a+1)(a^2-a+1)
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化简 a(a-1)^2-(a+1)(a^2-a+1)
化简 a(a-1)^2-(a+1)(a^2-a+1)
化简 a(a-1)^2-(a+1)(a^2-a+1)
原式=a(a²-2a+1)-(a³-a+a+a²-a+1)
=a³-2a²+a-(a³+1)
=a³-2a²+a-a³-1
=-2a²+a-1
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