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四字词语（第一个字与第四个字意思相反） 一、请你用所给词的适当形式完成下列句子.1.You are ______ (suppose) to shake hands when you meet a Chinese friend.2.Keep your eyes ______(close) when you are doing eye exercises.3.A knife is _____ (use) for _______(cut) things.4.Tree 若函数f(x)=(x-1)(x-2)(x-3)...(x-2007)函数 f(x)=(x-1)(x-2)(x-3)...(x-2007) 则f'(2007)=? 雷人和山寨的具体意思是什么?现在很流行这两个词!¬ 雷人和山寨的具体意思是什么?现在很流行这两个词! 流行词语山寨是什么意思是流行的就行了 第十一题求解（最好给步骤） 11,12题.最好有过程, 已知x^2-4x-5=0,求代数式136+4x^2-16x的值. 现在说“雷人”这么流行,雷人到底是啥意思?啥才算雷人? 已知函数f(x)定义在非负整数集上,且对于任意正函数x,都有f（x）=f(x-1)+f(x+1）若f(3)=2007,求f(2007) 已知函数y=x^2+(a-1)x+(2a^2-2a-100),且存在实数x使得y≤0,则最大整数a为 设函数f(x)=sin(πx/2+π/4)x 2道英语按要求改写句子 急求!1.A policeman can help make our city a safe place.(保持句意不变） A policeman can help ________ our city _______.2.My father has been an engineer for twenty years.（保持句意不变） My father has 2道英语同意句改写(着急!)1.He seems to enjoy pop songs very much.2.Talking with Jill is no use because he will never change his mind. f（x）=∫上限cosx 下限sinx （1-t^2)dt 求f（x）导数rt-（sinx^3+cosx^3) She is reading in the library中的“reading”要加ing He is ______（可能） in the librarypossible还是probably应该填副词还是形容词？ 已知恒式x^2-2x=1求(X-1）（3X+1）-（X+1）的值 如字成语 如字的成语有哪些 请问谁有商务英语谈判场景对话?感谢啦~~~急需啊! 存在整数a,b,c使等式(x-a)(x-2008)+2=(x+b)(x+c)对任何实数x都成立,则2a+b+c的值为 英语翻译1.Technology short circuits this thinking by making the problems obsolete.2.Likewise dependence on oil has created nation-states that are not dependent on taxation,allowing ruling parties to oppress minority groups such as women. we spent 50 dollars buying the bag（意思相同）The bag ____ _____50 yuanAll the young people are greatly interested in pop songs（意思相同）All the young people ______great _____in pop songsMy father is a professor So is my mother（意思 俩道英语改写句子~大哥哥 姐姐 帮下忙了 1.( )____team in Blue Sky Middle School used to help _____with their trainingA Boy's...the girls B Boy's...the girl C The boy's...the girls D The boy's...the girl2.( ）There is ____elephant show 已知x的三次方乘以x的a次方程与x的二a加一的次方等于x34次方求a的值 已知2的x次方等于4的y+1次方,27的y次方等于3的x-1次方,求x-y的值? 表示强烈的笑的词,急四字词 强烈的笑的词语 在三角形ABC中, some怎么读呀?