互动作业答案为什么不显

求5,6还有解题过程, 一元二次函数图像的旋转翻折对称及其函数式的变化 He dropped the vase. He took it into the living room.(用after连成一句话）似的赌东道厂 似的 After he cleaned the room ,he went shoppinAfter he cleaned the room ,he went shopping .(改为同义句) He _____ go shopping ______ he cleaned the room . 一袋中装有分别标记着号码为1,2,3,4数字的小球,若从这个袋中每次任取一个球,取出后放回,连续取三次（1）记”三次取球中最大号码为1“ 是件A,求P(A) ；（2）求三次取球中号码最大的数字恰 袋中有大小相同的四个球,编号分别为1.2.3.4.从袋中每次任取一个球,记下其编号,若所取球的编号为偶数,则把该球编号改为3后放回袋中继续取球,若所取球的编号为奇数,则停止取球.（1）求第 一袋中装有分别标记着1,2,3,4,5数字的5个球.从袋中取出一个球,取出后放回,连续2次,试求取出的2个球中最袋中装有分别标记着1,2,3,4,5数字的5个球.从袋中取出一个球，取出后放回，连续2次，试 二次函数按任意一点旋转180度的公式 二次函数绕某点旋转180度 解析式是什么二次函数旋转之后的解析式是什么,有公式吗,绕一次函数呢? 不分离用数字怎么表达谢谢了, 两地相距459千米,甲、乙两车同时从两地开出,4.5小时相遇,知甲车每小时行40千米.乙车每小时行几千米? 甲乙两车同时从相距765千米第两地相对开出,经过4.5小时两车相遇,甲车每小时行90千米,乙车每小时行几千米 甲乙两城凉相向开出,甲每小时行36千米,两车开出4小时后相遇时甲乙两车的路程比是6：5.乙车每小时行几千米 一袋中有写着1,2,3,4的4球,从袋中每次取1个球,取出后放回,连续取两次,求取出两个球数字之和＞4的概率 The old man walked into the house slowly.(改为同义句) The old man walked very slowly 该感叹句 _______by his granddaughter,thr old man walked very slowly.单选：A.Being supparted 老师说这是 正在被搀扶?B.Supparted 被搀扶?C.To suppart 要加宾?D.Be suppsrted 被动式不是be done 干嘛不选D?为什么选B,我要各个选项的 A little old man and his wife walked slowly into McDonald's on cold winter evening.They took a tab英语阅读理解 The old man walked slowly.S____ he fell down. 已知集合A＝｛a,a+b,a+2b｝,B＝｛a,ac,ac²｝.若A＝B,求C的值想预习高中的知识,因为我看辅导书的解答看得不懂（呜呜~）,说得明白点、简单点. 比10多50%的数是30的百分之几? 50的百分之30比一个数的一半多8,求这个数 I noticed he ___ th room A entering B entered C enters D enter可我觉得选B耶,但是你说排除BC,不是noticed+that从句吗?如果是notice sb to do/doing 或notice sb to do的话,后面的he不应该是him吗? The man was noticed _______ the room secretly A.entering into B.enter C.to enter D.to enter into I noticed he entered the room.I noticed them go into the teacher's office just now.这两句话句式不都一样,但为什么一个是entered一个是go into ,时态完全不同.到底谁对谁错? 在区间（0,1）内随机抽取两个数,则事件两数之和小于6分之5的概率为设两个数分别为x,y 0≤x≤1 0≤y≤1则x+y＜6/5与x轴、y轴、x=1、y=1围成的面积为S=1-(1/2)*(1-1/5)^2=17/25所以事件“两数之和小于6/ 在区间(0,1)中随机抽取两个数,求这两数之和小于5/6的概率 is the old man （ ） about his son?应该填 worry worried 还是worries The old man looks ( ) about his poor son's illness. A. worrying B. worries C. worried D. worry如题,我知道答案是C. 但是有个动词词组 worry about 请问这里为什么不能选D. 帮帮忙吧,十分感谢! From the ______ on his face ,we are all clear that he is worried about the safety of his son.(anxious) —Are you worried about his safety?—Only ______.A .gradually B.broadly C .slightly D.extremely 英语翻译