因式分解-9m^2-4n^2+12mn=________4x^2-16;a^4(x-y)+b^4(y-x);(a^2+1)^2-4a(a^2+1)+4a^2
问题描述:
因式分解-9m^2-4n^2+12mn=________
4x^2-16;a^4(x-y)+b^4(y-x);(a^2+1)^2-4a(a^2+1)+4a^2
答
因式分解-9m^2-4n^2+12mn=________
4x^2-16;a^4(x-y)+b^4(y-x);(a^2+1)^2-4a(a^2+1)+4a^2