金字塔闯入者必死之谜

集合D={平面向量},定义在D上映射f,满足对任意x∈D,均有f(x)=λx(λ∈R且λ≠0）(1)若│向量a│=│向量b│,且a,b不共线,证明[f(a)-f(b)]垂直于(a+b)(2)若A(1,2)B(3,6)C(4,8),且f(向量BC)=向量AB,求f(向量AC)乘以 I don't konw what to do.=I don't konw how to do it .为什么what不能加it 呢 贝壳的用途..去了海边 捡了些贝克 放了好几天了 挺碍事的 能不能做成装饰品 什么的 有好主意一定给分. I DON`T EXPECT THAT HE`LL COME BACK BEFORE NINE O`CLOCK,A.DO I B.WILL HE C.WILL NOT HE D.DO NOT I 将 烧贝壳的广告词翻译成英文 我越来越像贝壳了.翻译 他的弟弟收集贝壳有三年了怎么翻译 students did not spend their summer vacation in so many acyivities. Some students may even spend much money on buying game tools that they will feel satisfied.对不有没有语法错误 销毁的反义词 Mr.Zhang has visited Shaoxing Museum.I am going to _____him somewhere else tomorrow.A take B bring C push D carry 同义句转换 She got up early so that she could do some reading aloudHe is the strongest student in his classI don't know when we will have the meetingThis story made me excited most ''Don't read in bed! It's bad for your eyes'' Mother said to me1 简述电子商务的几个基本特点 电子商务的特征是什么? 简述ADO.NET由哪几部分构成 ADO.net中常用的对象有哪些?分别描述一下. Don’t say it if you don’t mean it.最佳翻译出来 If You Don't Mean It 歌词 我在凤凰山遇见一种比苍蝇大好几倍,腹部是黄色的昆虫,求名字 连词成句 the,played,I,games,enjoyed,I （.） sleep,a,they,day,hours,twenty 连词成句 koalas sleep 20 hours ( )day. 1.a 2.an 3./ sleep ,hours,about,usually,ten,I连词成句,拜托,马上要 You can not piay ball games in the classroom You can plat games in the v.You can play games in the v.... 真的有命中注定吗?那你信吗 don't cry for me 的意思 feed怎么读 我对未来的计划是什么? 某非命中注定早有天意 是哪首歌? 建工专业的未来5年工作计划书怎么写? 英语翻译他的兄弟想成为什么职业的一员?