Question

a三次方+a的二次方-a-1 因式分解

Answer 1

原式=（a^3-a)+(a^2-1)
=a(a^2-1)+(a^2-1)
=(a^2-1)(a+1)
=(a+1)^2(a-1)

Answer 2

a3+a2-a-1=a3-a+a2-1=a(a2-1)+(a2-1)=(a+1)(a2-1)=(a+1)(a+1)(a-1)=(a+1)的平方(a-1)

Answer 3

a�0�5（a+1)-(a+1) =（a�0�5-1）（a+1) =(a-1)(a+1)(a+1)