问题
填空题
m、n满足|m+2|+
|
答案
∵|m+2|+
=0,n-4
∴m+2=0,n-4=0,
解得m=-2,n=4,
∴(x2+y2)-(mxy+n),
=(x2+y2)-(-2xy+4),
=x2+y2+2xy-4,
=(x+y)2-4,
=(x+y+2)(x+y-2).
m、n满足|m+2|+
|
∵|m+2|+
=0,n-4
∴m+2=0,n-4=0,
解得m=-2,n=4,
∴(x2+y2)-(mxy+n),
=(x2+y2)-(-2xy+4),
=x2+y2+2xy-4,
=(x+y)2-4,
=(x+y+2)(x+y-2).