若f(xy,x+y)=x2+y2+xy ,则( )
( )
A.-1
B.2y
C.2(x+y)
D.2x
正确答案是A
扫描二维码免费使用微信小程序搜题/刷题/查看解析。
版权声明:本文由翰林刷题小程序授权发布,如需转载请注明出处。
本文链接:https://doc.20230611.cn/post/54300.html
上一篇:下列关于团队的特征,说法正确的是( )
下一篇:Vocabulary DevelopmentScan the following passage and find the words or phrases that have roughly the same meanings as those given.Getting the shuttle ready for its maiden voyage has not been easy. Many difficulties had to be overcome. One of the bigg