计算:a²(a-1)-2a(1/2a²-1/2a+1).

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计算:a²(a-1)-2a(1/2a²-1/2a+1).计算:a²(a-1)-2a(1/2a²-1/2a+1).计算:a²(a-1)-2a(1/2a&

计算:a²(a-1)-2a(1/2a²-1/2a+1).
计算:a²(a-1)-2a(1/2a²-1/2a+1).

计算:a²(a-1)-2a(1/2a²-1/2a+1).
a²(a-1)-2a(1/2a²-1/2a+1)
=a³-a²-a³+a²-2a
=-2a