若(x+y)2=9,(x-y)2=5,则xy=______. 发布时间:2017-05-14 19:35 │ 来源:www.tikuol.com 题型:填空题 问题: 若(x+y)2=9,(x-y)2=5,则xy=______.
题型:填空题 What _______ it will be when you _______ on the white sand in the warm sun!A.funny; lieB.fun; lieC.a fun; lieD.funny; lay 查看答案