关于匡衡的成语

高中数学.二项展开式问题.通项公式中的T(r+1).T是什么意思? 求通项公式：）已知(1) a1=2,an+1=an+n(2)a1=1,2^n-1an=an-1(n≥2）（3）a1=1,an+1=2an=4(n∈N）（4）a1=2,an+1=2an/1+an 利用二项展开式的通项公式求出倒数第n项的系数 怎么求 -2×1 2×2 - 2×3 2×4的通项公式 和2/1 -3/2 4/3 -5/4 的通项公式 "Wish you have a Happy Mid-Autumu Day "这句英语有没有错? Our holidays were ruined by the werther ---have stayed at homeA It may be as weB it was just as well weC We might just as welld we might do as well as wemight as well 后接动词原形也能接完成时吗 give money to me I do not have the money technology not to go to school have notworked我穷啊 没钱 没技术 没工作 没学上 我要完了 Nobody but Jane knows the secret.这个句子中主语是什么?（实在是有太多的争论了） nexton二项展开式 公式是什么写错了，是Newton二项展开式 If I were an inventor,I would invent many useful things to lighten my parents' pressure from work,If I were an inventor,I would invent many useful things to lighten my parents' pressure from work,so that they can have more time for me.Firstly,I would 用英文写一篇150字左右的"if you are an inventor,what will you invent?"的演讲稿 求100字英语作文,题目：If I were an inventor [急用丶丶 if not,give me more and more you__give the money back to me.I___it at present.A needn't,don't need B don't need to,needn't有没有高手可以解释下,这里need什么时候用情态什么时候用实义? You'll_______(give)some more money for your excellent work T^T 怎么写! tom s____ for help.but nobody came for a long time -Tom came to work last Friday,but no one has seen him since...-Tom came to work last Friday,but no one has seen him since.-_he have had an accident?A.ShouldB.Must C.MightD.Could我选了C,想到表猜测,应该都可以用吧= =看说话人怎么衡 Free to contact.I wish you a happy life every day! Have you just been to the cinema?麻烦详细分析下这句话的语法,每个词在句子中充当的什么成份,这个顺序我搞不懂啊. 学西班牙语的前途如何? 学西班牙语的前景虽然我知道,学一门外语不一定需要一个功利的理由,但我仍希望找一门实用性与我的兴趣俱合的外语.现在学西班牙语就业前景如何?学什么非英语外语比较有前景? 比如学西班牙语的前途的问题.我现在是高中生,喜欢西班牙语.希望大学或者将来能够学习到西班牙语,有机会在西国生活,可是现在我出先来如下几个问题.1.语言毕竟只是一种工具,难道只能当 have just been e-mooned里的最后一个单词是什么意思,这个句子又该如何翻译呢? 学西班牙语前景如何先报考语言学校 生男孩是到底和什么有关? i can't find my glasses.you see them?中的see的正确动词形式 谁懂得生男孩的科学方法,讲解下 ​ 科学上如何解释生男孩的内在规律 怎样才能生男孩? 生男孩子的方法?求一个科学合理的解释. 西班牙语的前途怎样? 学西班牙语发展前景怎么样