问题
填空题
计算:(-2x+y)2-(3y-x)(-x-3y)=______.
答案
(-2x+y)2-(3y-x)(-x-3y),
=4x2-4xy+y2+(3y-x)(3y+x),
=4x2-4xy+y2+9y2-x2,
=3x2-4xy+10y2.
故应填:3x2-4xy+10y2.
计算:(-2x+y)2-(3y-x)(-x-3y)=______.
(-2x+y)2-(3y-x)(-x-3y),
=4x2-4xy+y2+(3y-x)(3y+x),
=4x2-4xy+y2+9y2-x2,
=3x2-4xy+10y2.
故应填:3x2-4xy+10y2.