方程x2-ax+9=0的左边是一个完全平方式,则a=______. 发布时间:2017-05-14 21:01 │ 来源:www.tikuol.com 题型:填空题 问题: 方程x2-ax+9=0的左边是一个完全平方式,则a=______.
题型:填空题 In science fiction we read of flying saucers travel through _____ space, so people want to have ______ better knowledge of the universe.A.the; aB./; /C.the; /D./; a 查看答案