請問螢光筆畫的那兩個是怎麼弄的

求A = (4,4,16)對平面:x+y+z=21的對稱點 (A) (-2,-2,-2) (B) (2,2,14) (C) (6,6,30) (D) (-6,-6,-18) TT 正確答案:(B) r M •A' Assume that A' is the symmetric point of A in the above diagram. First, we computer, which is the line that passes through A and is perpendicular to π: x 4 y 4 Z- - 16 r: = = 1 1 Then, solving the following three simultaneous equations from r and π : x y = 0, x z = −12, x + y + z = 21 we find the intersection point M of r and π M = (3,3,15) Since M is the midpoint of AA', we have A-M A' = M - A' = 2M - A =2(3,3,15)-(4,4,16) = (2,2,14).

求詳解第四題

First fx++ f(x-1) = 6( X² 2x+1)-X+1th = 6x2 13Xt10 X 1 VO ( 4. Ekif (x-1) = x² + 5x-6, Ulf (x) = ( - 】。(15分) 5. 已知了 x+1 2x-1 =3x+2,則(-2)=【0】。(15分) 分

求解

25 Tuje 2 =logio? 10. 令 a= $ a= log2 loga V. x2 。 first 其中的11 VVTZ x2 共含108 層根號,則Q=

求解 謝謝🥺

om nortom al urn to the laughter V. 篇章結構 possible (A) and especially the Irish people (B) The shamrock is a green plant with three leaves that many people consider to be a lucky sic in his charm. (C) A patron saint is someone who makes extraordinary contributions to Christianity in certain 新試題 areas. (D) Food and drinks are often dyed an edible green color to showcase the uniqueness of this LOODUS Hof it more e and mico ping tradition. (E) However, it is thought that in fact there have been no snakes in Ireland since the last ice age. Every year around March 17th, you will see a lot of people in green outfits marching out on the street. It's the annual St. Patrick's Day! Who was St. Patrick? Why do people all wear green? And what do people do on this day? Let's find out. St. Patrick is one of the patron saints of Ireland. 1. These include churches, occupations, or even countries. There have been many patron saints in the long history of Christianity, and St. Patrick is one of them. He is honored by people around the world, 2. due to his many contributions to Ireland. TOCH According to several legends, St. Patrick freed Ireland from "snakes.” At first, people thought that logog otoplo St. Patrick got rid of a giant snake for the people in Ireland. 3. As a result, people speculate that the OS tor "snakes,” which St. Patrick banished from Ireland may, in fact, have been worshipers of “snake” gods. loin toon on St. Patrick banished these false gods for the Irish people and thus was given the title of “patron saint.” drooms As for the green outfits that people wear, the most common symbol of St. Patrick's Day is the shamrock. 4. Many choose to wear green clothes on this day and bring Irish-related items to the march, such as the flag of Ireland or Irish brands of drinks. Many restaurants and pubs offer Irish food and drinks, including Irish brown bread, beef and Guinness pie, and Irish soup. St. Patrick Day is celebrated in many parts of the world, especially by the Irish communities and organizations. Although people around the world celebrate the festival together, it is not considered a a lot of the countries. Still, people with different nationalities all share the same happiness 全新試題 nily. vite heir ave 5.Tv che ng to re holiday by of the festival. 4. nomore 5. ne 3. 1. 2. a

想請問為什麼A選項是對的？

請問下列各選項的推論或敘述哪些為真?\\DE ACDE (A)若2<x<5,則1<x<8 則1<x<8 (B若-1<x<2,則1<x<4 (C)某生「段考各科成績都不是班上的第一名」,是「段考總成績不是全班第一名」 的充分條件 (D)「ZBAC = 60°」是「AABC 是正三角形」的必要條件 (E)(x-1)(x-2)<0」是「1<x<2」的充要條件 B 3 2 2 2 2 2 2 2 2 2 2 4 he first (配

根本看不懂啦＼(￣▽￣;)／

Your report should follow these guidelines, although you may choose how you present it: How to Write a Mathematics Report In writing your report, remember that you are writing up a mathematical story and so, like all good stories, it will need a beginning, a middle and an end. More formally, the main components of this writing style are: Introduction, Formulating the Problem, Solving the problem, Discussion of Results, and Conclusion. We will now consider some of the detail in each of these aspects. Introduction This is the beginning of the story. Give a brief explanation of what the problem is about what the goals of the report are and what will be presented. Assume that your reader does not know what the problem is about or how to solve it. Formulating the problem Translate the situation into a maths problem. Explain how you will begin to solve the problem and break it into simpler stages. Discuss any assumptions made. What quantities are variables and which values are fixed? You may use sub-headings if they assist you. Solving the Problem Show any calculations and mathematical reasoning that you use. (Assume that your reader does not know much maths). Do not show the same types of calculations repetitively. Just give one or two examples of a calculation and then put the rest of the results in a table. Use diagrams or graphs if they assist you. Make general remarks about what you observe in your calculation results and, possibly, why. You may want to criticise your work and go on to improve it in the next section. Explain what you will do next and why. Discussion of Results - Evaluate and Verify Summarise your results if necessary and refer to your mathematical reasoning. Justify procedures used. Interpret your results. First, are they reasonable or does something not look right and need further investigation or checking? Is there a decision to be made? Here is where you should present the decision-making process. Evaluate the strengths and limitations of your solutions. Conclusion Summarise your findings. Refer to the problem outlined in the introduction. Make sure that you answer the question that was asked. Make recommendations. No new material should be presented here.

請問一下第47題有哪個大神回的嗎？ 😭😭😭求救~

Find the derivatlves of JOI 蛻說2二一一二一 kwy三XX一1)( 十2) 十 Find the first and SGCODd de 說

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24b(╥_╥)如果沒代數字怎樣計🤢

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求各位好心人家幫幫忙♥️感恩

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