问题
填空题
化简
|
答案
根据题意得,
①当x≥0时,
=x4+x2y2
=xx2(x2+y2)
;x2+y2
②当x<0时,
=x4+x2y2
=-xx2(x2+y2)
;x2+y2
故答案为x
或-xx2+y2
.x2+y2
化简
|
根据题意得,
①当x≥0时,
=x4+x2y2
=xx2(x2+y2)
;x2+y2
②当x<0时,
=x4+x2y2
=-xx2(x2+y2)
;x2+y2
故答案为x
或-xx2+y2
.x2+y2