a^4-4/9a^2
问题描述:
a^4-4/9a^2
答
a^4-4/9a^2
=a^2(a^2-4/9)
=a^2(a+2/3)(a-2/3)
a^4-4/9a^2
a^4-4/9a^2
=a^2(a^2-4/9)
=a^2(a+2/3)(a-2/3)