急!因式分解

题目

急!因式分解
m^3m^2-m^5与x^4加6x^2加9与4a^3-4a^2加a

答案

m^3m^2-m^5
=m^(3X2)-m^5
=m^6-m^5
=m^5(m-1)
x^4加6x^2加9
即:x^4+6x^2+9
=(x^2+3)^2
4a^3-4a^2加a
即:4a^3-4a^2+a
=a(4a^2-4a+1)
=a(2a-1)^2