3a^2-6a+12= (分解因式)
问题描述:
3a^2-6a+12= (分解因式)
答
3a^2-6a+12
=3( a^2-2a+4)
=3(a^2-2a+1+3)
=3(a^2-2a+1)+9
=3(a-1)^2+9