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已知函数fx是定义域是R的偶函数,若fx在(0,到正无穷）上是增函数 证明fx在（负无穷,0）上是减函数 9x-5y+z=5 9x+y+4z=14 -9x+3y-5z=-11 《1》x+y=z 《2》7z-(x+y)=2 《3》x+y+z=14 三元一次方程急用,快嚸, 求函数f（x）=x^3-2x^2+2的零点我解到x^2(x-1)-(x-1)(x-2) 解方程：x+z=y (1) ,7z-(x+y)=2 (2) ,x+y+z=14 (3) x+z=y 7z=x+y+2 x+y+z=14 解三元一次x+z=y7z=x+y+2x+y+z=14解三元一次 请帮我修改一下这篇英语演讲稿,有没语法错误Nothing is impossibleHello everyone,before the talk,I want to talk something about Wang Shouren.he had ever said that he wants to be a sage like Confucius.But the only thing he got was the 英语演讲稿!帮我检查下有没有语法错误,并纠正,hi,everybody.Today,i will simply introduce one of my favourite companies--blizzard.Refer to blizzard,we can think of STAR CRAFT,DIOBLO,WARCRAFT ,WORLD OF WARCRAFT and so on so many classi 4x-3y-6z=0 x+2y-7z=0 三元一次方程组4x-3y-6z=0 x+2y-7z=0 （xyz不等于0）求（5x^+2y^-z^）/(2x^-3y^-10z^) 英语 请帮我修改一下演讲稿中的语法错误,明天要用很着急!Introductionof my friendMorning,ladies and gentlemen.Today,I’ll introduce a friend of mineto you.At the first sight of him,I thought he’s so funny.And at the firstheari 帮忙改一个英语演讲稿,由于语法错误啊I’m very glad to stand here and give you a short speech.Today my topic is “youth”.I hope you will like it,and found the importance in your youth so that more cherish it.First I want to ask you 检查一下英语演讲稿有没有语法错误I hope our study will be more funnyIn Chinese class,you will always see such a scene.A teacher,holding chalk,facing the blackboard,ever writes a lot of words.The students holding pens,look at the blackb 英语的一道题请问,--Have you got ________ strawberries?A.some B.many C.any 是哪一个? 希腊神话中有哪些故事 希腊神话的故事有什么书是可以看正个过程的故事?又或者电影,或者电视剧,就是想知道希腊神话的整个故事. 希腊神话全部故事有很多 不全 都是一个一个的 谁能给个全的地址看?全部的故事...一定要全上面的问题作废...- 谁的希腊神话写的比较好?那个版本比较好 本人想深入了解一下希腊神话 英语,检查语法错误并改正~You may only be a person in this world,but for someone,you are the world...somehow I feel it faintly familiar to the emotion I am now! 希腊神话小故事既要短,又要清晰! 英语翻译The sun will always remember the moon,no matter how much the moon likes the stars.太阳会一直记得月亮,无论月亮有多么喜爱星星The stars will always remember the sky,no matter how much the sky misses the earth.星星会一 希腊神话的所有人物介绍 和一些故事 -英语上的一道题Cotton_____soft.A.fells B.felt C.is felling D.is felt最好能带解析；答案要准确我没有写错，本题有正确答案。 帮忙检查下这段英文吧,改出语法错误There are many we can recall the moment,these sounds nothing new,but we see when they cry.This drama are" trifles",but it is in these places portrays the characters' personalities,let them become fresh 帮我检查一下这堆英文有没有语法错误I first read “DORABASE”（书名） in 2006.It was first cartoon about I have read.It was wonderful and I fell in love with it the first time I read it.We have some online communities on this car 帮我看看这段英文有没有语法错误,或者需要改正的地方.Casual spitting,littering,name-calling.if asked to list all the "what things is it that you can never tolerate" ,there are far more instances than we have just enumertaed.It is 英语 英语的一道题求教.帮我把这句话翻译成英文 ：他从不在网上 购物.He never shops on the Internet ——————后面三个横线该填什么?但一楼答案太过离谱,所以分给二楼. 已知tanA,tanB是方程2X方+3X-7=0的两个实数根,求tan(A-B)的值?..本人是一个数学白痴. x分之1是不是一元一次方程 若函数 f(x)=7x的平方-（k+13）x+k的平方-k-2有两个零点x1,和x2 且 0 高一数学函数与方程问题啊 !若函数f(x)=-x^3-3x+5的零点所在的区间为（k,k+1),其中k属于Z,求k的值我的意思你你刚开始就知道零点就在(1,2)的吗?还是一个一个代入,找到的?比如先代入-2,-1,0.......等 9x-5y+z=16,9x+y+4z=16,-9x+3y-5z=-2求三元一次方程 x分之1=2 这是一元一次方程吗?跟我说下为什么