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心理学作业针对你所在地区的青少年学生心理特点,写一个调查报告,要求字数不少于2500 .k为何值时,方程x²-kx+k-4=0 ①有两个正根 ②只有一个正根都要考虑那几个方面.麻烦步骤清晰的哈 . 碳酸钠与稀硫酸反应能否用做实验室制取Co2?求化学帝们解救一下困境中的我在下感激 不尽我认为这位的答案才是我真正所需要的…… 药理帝,小弟想制作一种特殊弹珠就是弹弓用的那种弹珠..希望的效果是:打在目标身上能释放粉末(例如辣椒粉),造成目标行动力暂时消失的..而且在储存和装填时不会释放出粉末..请问如何实 求知识竞赛后有什么收获,作文,800字左右有才的快出来发挥下! 不要复制粘贴 .越详细越好. 一个操场知道了实际长和宽怎么求比例尺?一个菜地知道了实际长宽和比例尺,怎么求图上的长和宽? 已知方程（x-1）²=k²+2的一个根是x=3,求k的值及另一个根 一道不等式的题目,x,y,z为非负实数,求证x/(2x+y+z)+y/(x+27+z)+z/(x+y+2z)不大于3/4 一元不等式方解决问题1.摄氏度(°C)和华氏度(Fo)的关系可用以下的公式表示:F=9/5(°C)+32.已知水银在华氏温度-32.8(Fo)与674.6(Fo)之间时才是液态,求液态水银在摄氏刻度上的可能范围.2.某城市的出 用不等式解决问题一元一次1.某班打算用100元的班费买些笔记本和圆珠笔做奖品发给运动员,已知每本笔记本价格是9.4元,每支圆珠笔价格是7.6元.若需购买12件奖品.问最多可买几本笔记本?2.某 谁来帮我解决一道高中不等式题已知a,b,c为某一直角三角形的三边长,C为斜边,若点(m,n)在直线ax+by+2c=0上,则m2+n2（平方和）最小值是多少? Away you dirty your hands!谁能帮翻译一下 解不等式的题目,快（1）3+x＜4+2x （2）-2≤2（1-3x）/5＜75x-3＜4x-17+2x＞6+3x（3）已知关于x的不等式组x＜2a-1x＞a+5 无解,求字母a的取值范围（4）已知方程组2x+3y=3a-2x-2y=a+1 的解是x＞0y＞0,求字母a 请问 功崇惟志,业广惟勤 用英语怎么翻译 功崇惟志,业广惟勤 功崇惟志,出自哪里? 英语翻译要押韵的.、或者有排比性质的比如上半句great contributions come from great ambitions 2,-4,8,-16,32……第n个数是多少 ____ the help of the tree teacher ,I got full marks in the math exam. three students got full marks in the math exam _____me,jenny and victor didA beside B besides C except 功崇惟志,业广惟勤.用繁体字怎么写?急! 帮我的是我男神女神啊!其实这是物理题! 奖励翻倍）因为所以的格式根据不等式额性质,将下列不等式化为x＜a或x＞a的形式2x＜x-3 -3x＜x+4 初三英语单选题 Don't ( ) your hands dirty,做做好人吧Don't ( ) your hands dirtyA,let B,get C,make D,keep请说明理由.小弟没分了,做做好人. SOS!英语改错!My father enjoys playing the golf very much. SOS急：初2英语改错1.There is a bit water in the water2.Would you please not to do it agin?3.he bought this book for two days.4.The TV play is worth to watch.5.It was happened on a cold moring6.Neither Tom nor Jim have finished the work7.You mu Don't _____ your hand dirty,Tom.A.get B.makes C.has D.take SOS~10道改错题,急~(2)11.People(A) around world(B) are much concerned(C) with(D) the situation in Iraq.12.When we were(A) having breakfast(B), We looked at the handsome boy(C) who was playing piano(D).13.Students are very enthusiastic(A) in apply SOS~10道改错题,急~(3)21.Because most photographic filters work(A) by subtract(B) portions of visible light from the subject, they decrease(C) the intensity of light that reaches(D) the film.22.The wingspread of various species(A) range(B) from o I get dirty whe your face and hands become cieam.What am I 甲车从A地,乙车从B地同时相向而行,当甲车行了A、B路程的20分之3的时候,乙车行了A、B路程的5分之1,当甲车距B地还有A、B路程的4分之1的时候,乙车正好到达A地,并立即返回,当甲车到达B地时,乙