已知抛物线y=ax2+bx经过点A(3,3)和点P(t,0),且t≠0. (1) 发布时间:2017-05-09 03:36 │ 来源:www.tikuol.com 题型:解答题 问题: 已知抛物线y=ax2+bx经过点A(3,3)和点P(t,0),且t≠0.(1)若t=2,求a、b的值;(2)若t>3,请判断该抛物线的开口方向.
题型:解答题 帮助下列词汇在下面的文章中找到它们的家。 studied teacher retired taught learn ago pupil an teaching Ten years _ l , Mr Li was a __2 . He __3 _ Chinese. Chen Hai was in his class. He was a good 4._____. He _ 5 _ very hard. Now, Mr Li is _ 6_ . He's __7 _ English. Chen Hai is _ 8 _ English teacher. He's 9 Mr Li. 查看答案
题型:解答题 某钢结构厂房工程,基础为预应力管桩基础,轻钢门式钢架结构,彩钢板屋面。钢柱有等截面和变截面柱,框架外包墙及办公区域墙体采用砖砌体,强度等级为MU10,其中办公区域楼板采用非预应力预制钢筋混凝土空心楼板。钢结构构件涂装施工环境的湿度一般宜在相对湿度小于()的条件下进行。A.50%B.60%C.70%D.80% 查看答案