化简(x2+xy+y2)2-4xy(x2+y2)的结果应为( ).A.((x2+xy
题型:单项选择题
问题:
化简(x2+xy+y2)2-4xy(x2+y2)的结果应为( ).
A.((x2+xy+y2)2
B.((x2-xy+y2)2
C.((x2-2xy+2y2)2
D.((x2+xy-2 2
E.(A、B、C、D都不正确
化简(x2+xy+y2)2-4xy(x2+y2)的结果应为( ).
A.((x2+xy+y2)2
B.((x2-xy+y2)2
C.((x2-2xy+2y2)2
D.((x2+xy-2 2
E.(A、B、C、D都不正确