计算:a²(a-1)-2a(1/2a²-1/2a+1).
问题描述:
计算:a²(a-1)-2a(1/2a²-1/2a+1).
答
a²(a-1)-2a(1/2a²-1/2a+1)
=a³-a²-a³+a²-2a
=-2a