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函数y=x/kx^2+kx+1的定义域为R,则实数K的取值范围为当K=0时合题意当K不等于0时 为什么它的K不会小于0?还有 K^2-4k小于0这个不等式要怎么解 计算10^lg3=________;log8 9·log9 64=______. 怎们算log9 27? 计算log9底8分之log3底2 修一条路,第一天修了全长的1/5,第二天修了全长的25%,还剩下8.8千米没修,这条路全长多少千米?要写过程！再请大家讲解一下。谢谢咯！ 14\3.64=?怎么算 英语翻译When he was ten years old,the boy died.________________________________________也就是用英文写出另一个一是相同的句子. 英语翻译1.The film began ten minutes ago.2.He didn't catch up with his classmates because of the illness.3.He has been away from here for two years .4.People believe that Einstein is one of the greatest scientists in the world.5.Work hard,or you 英语翻译1.what would you like to do during your holiday?2.Turn left at the first turning.3.Where is the Zhongshan Building?4.What about going abroad for a holiday?5.Why not see a flim with me? 英语翻译1.Dick is a very clever boy.2.We Chinese use chopsticks to eat(use chopsticks to eat划线）3.Sandy is 14 years old.4.Yao Ming is the most famous of all the basketball players in China.5.They went shopping yesterday.( went shopping 划 汇编语言段内,如何看出是段内,还是段间 师徒俩人合作加工一批零件,师傅独做要10天,徒弟独做要12天,合作途中,徒弟病假3天,从开工到完工一共用多少天? 完成某项工程,甲单独工作需要60个小时,乙需要50个小时,并需要30个小时,现在甲先做1个小时,然后乙做2个小时,再有丙做3个小时,接着甲做4个小时,乙做5个小时,丙做6个小时,三个人轮换工作没知 一段铁路,甲队独铺要10天完成,乙队独铺要15天完成.现在两队合铺完成时,甲队铺了这段公路的几分之几? 小王和小张同时打一份稿件,5小时打了这份稿件的六分之五.如果由小王单独做,10小时可以打完.求如果由小张单独打,几小时可以打完? 如图点d是三角形abc的边ab的中点,且de平行于bc,求证e是ac的中点且de等于二分之一bc 英语翻译1.It's difficult for the little girl to dress herself.2.It was careless of me to leave my key at home.3.The box is big enough to hold the new TV.4.He isn't brave enough to go into that cave.5.It is really an interesting programme.6.The mo 英语翻译（1）He spends two hours doing his homework（2）I always hear from my pen-friend（3）He seldom goes there by buy （4）I have to look after my sick dog（5）They have lots of presents（6）They paid two hundred yuan for the camer 英语翻译1 Is she able to sing this song in English?2 The boy couldn't explain why he was late for class to the teacher.3 I can't agree with you in a way.4 The newly built railway connects Shenzhen to xiamen.5.The students in class two won the mat 两车分别同时从甲乙两地相向而行,6小时相遇,相遇后继续前进4小时,一车到达乙地,另一车离甲地还有181千米,甲乙两地相距多少千米? 甲乙两地相距70千米,一辆汽车和一台拖拉机同时又两地相向而行1小时24分钟后相遇.相遇后拖拉机继续前进,汽车在相遇点停留2/7小时后调头追拖拉机,在第一次相遇半小时后追上了拖拉机,问这 甲乙两地相距70千米,一辆汽车和一台拖拉机同时又两地相向而行1.4小时后相遇.相遇后拖拉机继续前进,汽车在相遇点停留2/7小时后调头追拖拉机,在第一次相遇半小时后追上了拖拉机,问这是汽 甲、乙两地相距275千米,一辆货车和一辆小轿车同时分别从甲、乙两地出发,相向而行,2小时后相遇.已知货车的速度是60千米/小时,求小轿车的速度是多少. 下面的分数化成小数.(不能化成有限小数的,保留3位小数 )11/12,63/100,17/20,3/7,4/11 一只老鼠从a点沿着长方形的ac方向逃跑,一只花猫同时从a点朝另一方向沿着长方形去捕捉.结果在距b点3米的c点捉住了老鼠.已知老鼠所走路程是花猫的11/14,求长方形的周长是多少?一群笨蛋， 两辆汽车同时从两地出发相向而行大货车每小时60千米这条路共长275千米.2.2小时后相遇小车的速度是多少. 六年级考试问题 急!急!一个高为5dm的圆柱如果它的高增加3dm,那么它的表面积就增加18.84dm,原圆柱的体积是多少?一个圆柱形的油桶,装了半桶油,把桶里的的油倒出3/5,还是剩下几升油,已知油桶 7．已知集合A＝{x | ax 2 – 3 x – 4 = 0,x∈R},（1）若A中有两个元素,求实数 a 的取值范围；（2）若A中至多有一个元素,求实数 a 的取值范围.我也无语了，为什么到现在一个答对的都没有！ 在迎新春活动中,甲、乙、丙、丁围成一圈依序报数,规定：①甲、乙、丙、丁首次报的数依次为1、2、3、4,接着甲报5、乙报6……按此规律,后一位同学报的数比前一位同学报的数大1,当报的数 一道数学题,求大家帮忙解一下!这是关于初一的一元一次方程的题目甲、乙、丙3人一起比赛跳远,第1到3名分别得3、2、1分（不排名次）,一共经行了5场比赛,甲总共得了14分,乙第1轮得了3分第2 娘就是妈,所以,可以写成：娘=妈姑=姑,所以,姑+娘=姑+妈,即姑娘=姑妈错在哪里? 如图长方形OABC中,O为平面直角坐标系的原点,A、C两点的坐标分别为（4,0）,（0,6）,点B在第一象限内点P从原点出发,以每秒2个单位长度的速度沿着O─A─B─C─O的路线移动﹙即沿着长方形移动