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数学家的小故事20字 周期函数的定义域一定是R吗 求函数y=3tan(π/4-2x）的定义域、周期、单调区间 born是什么词 be born表示什么 were born呢 The twins were born in Britain..(改为反意疑问句） the twins were born in Britain.反意疑问句 The twins were born in Britain,【 】【 】.括号里填什么 介词填空.they were born___a cold evening. 改错 He was born in a winter evening. i like this interesting book.Can you give me it? i was born ( ) the evening of Jone 13,1994填写in 还是on? 求函数y=2tan(π/6-x/3)的定义域、最小正周期及单调区间 1、函数y=2tan(π/3-x/2)的定义域是?周期是?2、函数y=tan(x/2+π/3)的递增区间是? 求函数y=2tan(2x+π/6)的定义域、周期和单调区间 1、已知一个等差数列的首项为5,公差为10,第21项是?2、一项工程,由甲单独做12天可以完成,甲队做了3天后,另有任务,余下的工程由乙队做15天完成.求乙队单独做这项工程要多少天?3、一片草地, she was born ( )the evening ( )april 3rd 数学家的小故事30字 The baby was born _______ the evening _______ April 3rd.a.in; of b.in; onc.on; of d.on; at为什么是on of？ he was born （ ）a rainy evening括号里应添in还是on? 几道数学题 要快哦 在线等一.某商品打七五折出售可便宜90元,该商品原价（ ）元,现价（ ）.二.小明家买了一套住房,房子的原价为24万元.由于一次性付清房款,小明家买房时享受了九五折优 计算下面三题：(y-x)的立方×(x-y)的m次方×(x-y)的m+1次方×(y-x)的平方；(十三分之五)的2012次方×(二又十三分之三)的2013次方；(3x-2y+z)(3x-2y-z)； 高一数学用判别式法求函数值域时为什么要注意定义域的取值,请举例 He was born on March 1st(改为同义句)( )( )( )March 1st. 直线l的方程为x-y-2=0,它关于点（1,4）的对称直线方程是？ 用判别式法△≧0是不是因为定义域为全体实数x始终有解 高中基本数学题!设点P(-3,4)是角&终边上一点,则tan(180度-&)=? 使用判别式证明恒成立时为什么未知数定义域要为实数集R （M^2--2M-3）x^2-(M-3)x-1 用判别式法求值域为什么要X为全体实数? 3x（x的2次方－x－1）（x＋1）（3x－3）其中x＝－1 3X(X+1)-(X-1)的2次方>2（x-3)的2次方,X=?要过程 a的3次方x+a的-3x=52则a的x次方+a的-x次方=? 若3的3x-5次方=1,则x= my brother was born ___the evening of march 6th,1980 A in B on 应该选哪个