光谱线宽度

是否存在常数k∈R,使函数f(x)=x4+(2-k)x2+(2-k)在(-∞,-1]上是减函数,且在[-1,0)上是增函数 是否存在常数k属于R,使函数f(x)=x^4+(2-k)x^2+(2-k),在(-无穷大,-1】上是减函数,在[-1,0]上是增函数? 英语翻译 谁可以帮我翻译一下谢谢부천시 오정구 고강1동 英语翻译전화해주심시오 只有这么多积分 全给 在线等：翻译下：부산광역시 남구翻译下：부산광역시 남구 대연3동 599-1 번지 부경대학교 대& 英语翻译请问怎么翻译呀 在平行四边形ABCD中,AE垂直BC与E,AF垂直CD于F,AE=4,AF=6,平行四边形ABCD的周长为40,则平行四边形的面积是?  商场将进货价每个30元的台灯以每个40元卖出,平均每月售出600个,如果每个台灯售价每上涨1元,销量就减少10个,每个台灯售价为45元,那么这种台灯销售利润为多少?这种台灯销售利润能达到10000 The merit of sales tax ( ) decreases government reliance on income taxes.(本题分数：2 分.)1.The merit of sales tax ( ) decreases government reliance on income taxes.(本题分数：2 分.) A、 is that it B、 that it C、 that is D、 it is 2. ate是什么意思啊! 已知关于x的一元二次方程mx2+m2+3m=0 有一个根为零  求m的值 The government charged the citizens with income tax这句话中charge的用法是否正确? The merit of sales tax ( ) decreases government reliance on income taxes. The government has made ____every citizen should pay his or her income tax.A.that clear B it clear that C clear that D us clear that为什么选B 要简洁理由.两个小时以内. 英语翻译아리랑 아리랑 아라리요 아리랑고개를 넘어간다.나를 버리고 가시는 ᇢ 英语翻译아가리에서 털어 다시 돌아와 줘 帮我翻译下 高中英语必修一 第一题怎么填 伊索是什么国籍的寓言家 真的有伊索这个人吗?急切知道! the ambulance came and rushed them to the hospital怎样翻译 英语翻译谢谢hospital plan to aid grassroots 키 다 리 아 저 시 英语翻译可是韩文调味料不是这种写法啊。 One day I want you to know that you do not have the capital to force the installation in front of m 春节的由来【非常简单】 求写一篇关于初中的日记 初中的一篇日记,请看看.请看看哪里语法错了谢谢.Saturday,may 13,2006 sunny.interesting placeIt was friday afternoon.as usual ,I went to class.after a time,my friend Tom walked up to me and said that would invit me to go to his house 求一篇初中日记,现在放假!比如去哪玩什么的 求一篇初中的普通日记 伊索的寓言 急