a3+a2-a-1怎么算
问题描述：
a3+a2-a-1怎么算
答
a3+a2-a-1
=a^2(a+1)-(a+1)
=(a+1)^2(a-1)
答
原式=a2(a+1)-(a+1)
=(a+1)(a2-1)
=(a-1)(a+1)^2
答
a³+a²-a-1
=a²(a+1)-(a+1)
=(a+1)(a²-1)
=(a+1)(a+1)(a-1)
=(a+1)²(a-1)