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x4+y4+(x+y)4-2,
=(x2+y2)2-2x2y2+(x2+2xy+y2)2-2,
=(x2+y2)2-2x2y2+(x2+y2)2+4xy(x2+y2)+4x2y2-2,
=2(x2+y2)2+2x2y2+4xy(x2+y2)-2,
=2[(x2+y2)2+x2y2+2xy(x2+y2)-1],
=2[(x2+xy+y2)2-1],
=2(x2+xy+y2-1)(x2+xy+y2+1).
故答案为:2(x2+xy+y2-1)(x2+xy+y2+1).
=(x2+y2)2-2x2y2+(x2+2xy+y2)2-2,
=(x2+y2)2-2x2y2+(x2+y2)2+4xy(x2+y2)+4x2y2-2,
=2(x2+y2)2+2x2y2+4xy(x2+y2)-2,
=2[(x2+y2)2+x2y2+2xy(x2+y2)-1],
=2[(x2+xy+y2)2-1],
=2(x2+xy+y2-1)(x2+xy+y2+1).
故答案为:2(x2+xy+y2-1)(x2+xy+y2+1).
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