因式分解:-3x2+6xy-3y2=_.
问题描述:
因式分解:-3x2+6xy-3y2=______.
答
-3x2+6xy-3y2=-(3x2-6xy+3y2)=-3(x2-2xy+y2)=-3(x-y)2,
故答案为:-3(x-y)2.