已知A(3,0),B(0,4),直线AB上一动点P(x,y),则xy的最大值是 发布时间：2017-05-05 23:43 │ 来源：www.tikuol.com 题型：填空题 问题： 已知A(3,0),B(0,4),直线AB上一动点P(x,y),则xy的最大值是 .
题型：填空题 从方框中选择适当的词语填空，其中有一个词是多余的。must be. can be, can't be, belong to, final, owner1. The bike _ __ your father's or your mother's. They both have a black bike.2. This homework Jim's. He wasn't at school today.3. Can you help us to find the __ of this red backpack?4. The blue sweater ___ _ my sister. She is the only one who likes blue best in my family.5. This is our exam in our school. After that we will graduate. 查看答案
题型：填空题 举重运动员在地面上能举起120 kg的重物，而在运动着的升降机中却只能举起100 kg的重物，求升降机运动的加速度.若在以2.5 m/s2的加速度加速下降的升降机中，此运动员能举起质量多大的重物？(g取10 m/s2) 查看答案