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证明函数增减性的问题已知定义在R+上的函数f(x)同时满足下列三个条件：(1)f(3)=-1；(2)对任意x,y属于R+,都有f(xy)=f(x)+f(y)；(3)x>1时,f(x) 证明增减函数已知函数y=f(x)是奇函数,在(0,+∞)内是减函数,且f(x) 证明函数增减性,证明f(x)=2的x次方-4的x次方在[0,1]上单调递减 证明函数增减性f(x)=-3x+4在R上是减函数 谁有八年级下英语作业本的答案啊 问一些杂题.（物理,英语）1、夏天小强从游泳池里出来,冷得直哆嗦,这是因为水______,可是他却惊奇地发现,旁边的一只小狗却在伸出舌头,不挺地喘者粗气,这是因为____,这样可以增加______并且 经过点（1,3）其切线斜率为3X^2的曲线方程? 高中数学必修一《集合》的表示有几道题,1.方程2x+Y=5(X∈R,Y∈R)的解集,用描述法表示（下同）.2.集合﹛1,根号2,根号3,2,根号5.﹜还有一题：设集合G中的元素是所有形如a+b倍根号2（a∈Z,b∈Z）的 高中数学题,求解析过程和答案? 请帮忙分析正确选项,It`s dangerous here.Please take the children to___.A.safe B.be safe C.safety D.safely请重点分析B和C选项. 写错的那三道 为什么我爱你,你不爱我 问一道英语选择问题?-----her father was born in june,Dodd chose to hold the first Father's Day celebration in Washington on June 19,1910.为什么选as,不用for呢? 证明二次函数f(x)=a(x平方) + bx + c (a 一道高中数学函数与不等式证明题已知函数f(x)=—cosx,g(x)=2x—π,x1∈[0,π],g(x(n+1))=f(xn),求证:|x1—π/2|+|x2—π/2|+|x3—π/2|+……| x(n+1)—π/2|＜π(n∈N*)其中n与(n+1)均为脚标解析或答案能上图最好 已知直线x=a为函数y=f(x)的一条对称轴1求证 f(x)=f(2a-x)2如果x=b(a>b)也是函数的对称轴 该函数是否有周期性 并证明 提问一道英语选择The train _____ she was traveling was late.A.which B.where C.on which D.in that是选C,为什么不选A, 英语选择一道 提问The roof feel ___ he had time to dash into the house to save his baby.A.as B,after C.until D.before 1.Could you tell me ____ answer to this problem?I can't work it out myself.A.an B.the C.不填2.He ____ less time reading stories about film stars than before.A.takes B.spends3.-How do you know that she likes singing -I often hear her ____ after clas 1.i was ______ out to visit my aunt in the nearby town ______it began to rain heavily.A.about to go,whenB.about to go,whilec.to go ,asD.to go,until2.i know how to _____the boy work if you ___me take care of him.A.let,makeB.let ,letC.make,letD.make,wa 不要只给出答案,还要给出解释说明为什么选这个,These circumstances were far from being ordinary and Smith hand a ______reason for being here personally.A twofold B couple C bilateral DdoublingIn other words,all mammals,_____ their s 我爱你当是你不爱我英语怎么说 "我爱你是我的事,与你无关;你不爱我是你的事,与我无关"用英语怎么说 问道高中数学的分段函数题~甲同学家到乙同学家的途中有一公园,甲从家到公园的距离与乙从家到公园的距离都是2km,甲10时出发前往乙家．如图,表示甲从出发到乙家为止经过的路程y（km）与 确定函数,判断增减.已知f(x)=ax2+1/bx+c（a,b,c属于R）是奇函数,且f(1)=2,f(2)=31）求a,b,c的值；2）证明：当x>2分之根号2时,f（x）为增函数. 一道高中数学题（判断增减函数）已知函数f(x)是偶函数,而且在(0,+∞)上是减函数,判断f（x）在（-∞,0）上是增函数或减函数,并证明你的判断 一道英语选择题,感觉两个选项没区别,求解析She said to me():"This way,please."a.kindlyb.friendly 一个英语选择题 分析各个选项,谢谢------in a friendly way,they both were satisfied with the result a having been settled their quarrel b their quarrel being settled c their quarrel settled d after their quarrel se 请教一道一直不能理解的英语选择 呵呵 1.Many problems ____have been overcome --or _____never have arisen---if the people involved had just treated one another with commom courtesy.A would,should B should,would C might,could D could,mig 用三段论证明:函数f(x)=-x2+2x在(负无穷,1]上是增函数直线平行于平面,则平行于平面内所有直线；已知直线b不属于平面m,直线a属于平面m,直线b平行于平面m,则直线b平行于直线a结论显然是错误的 用三段论证明函数f(x)=-2x^2+3x在[3/4,+∞）是减函数 用三段论证明增函数用三段论证明:函数f(x)= √(x-1) 在[1,正无穷大）上是增函数?THANKS!