若x2+kxy+49y2是一个完全平方式,则k=______. 发布时间:2017-05-14 23:48 │ 来源:www.tikuol.com 题型:填空题 问题: 若x2+kxy+49y2是一个完全平方式,则k=______.
题型:填空题 In Britain today women 44% of the workforce, and nearly half the mothers with children are in paid work.A.build upB.make upC.take upD.send up 查看答案