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Summary of math content, m4, relationships and functions.

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... Read moreถ้าใครค้นหา “สรุปฟังก์ชัน ม.4” แล้วอยากได้แนวเช็กคำตอบเร็ว ๆ ก่อนทำโจทย์ เราแนะนำให้ไล่ตามเช็กลิสต์นี้ (ใช้ได้กับเนื้อหาคณิตศาสตร์ ม.4 เทอม 1 หลักสูตรใหม่ด้วย) 1) ความสัมพันธ์ vs ฟังก์ชัน (ต้องจำให้แม่น) - ความสัมพันธ์คือ “เซตของคู่อันดับ” (x,y) จะมาจากผลคูณคาร์ทีเชียน A×B ได้ - ฟังก์ชันจาก A ไป B คือความสัมพันธ์ที่ “แต่ละ x ใน A ต้องจับคู่กับ y ใน B ได้ ‘เพียงค่าเดียว’ ” ทริค: ถ้าในคู่อันดับมี x เดิมซ้ำ แต่ y ต่างกัน = ไม่เป็นฟังก์ชันทันที 2) หาโดเมน–เรนจ์แบบไม่หลุดเงื่อนไข (อันนี้คนพลาดบ่อย) - โดเมน (Domain): ค่าของ x ที่ “แทนได้จริง” ตามเงื่อนไขของนิพจน์ - เรนจ์ (Range): ค่าของ y ที่เกิดขึ้นได้จากโดเมน เช็กเงื่อนไขสำคัญที่เจอในบทนี้: - รากที่สอง: ใต้รูทต้อง ≥ 0 - เศษส่วน: ตัวส่วนต้อง ≠ 0 - ลอการิทึม: สิ่งที่อยู่ใน log ต้อง > 0 และฐานต้อง > 0, ≠ 1 - สมการกำลังสอง/พาราโบลา: เรนจ์มักดูจากค่าสูงสุด-ต่ำสุด (vertex) หรือใช้การทำกำลังสองสมบูรณ์ 3) เช็ก “หนึ่งต่อหนึ่ง” และ “ทั่วถึง” ให้เป็นระบบ - หนึ่งต่อหนึ่ง (one-to-one): x ต่างกันต้องได้ y ต่างกัน วิธีเช็กไว ๆ: • จากคู่อันดับ: ห้ามมี y ซ้ำ (เมื่อเป็นฟังก์ชันแล้ว) • จากกราฟ: ใช้เส้นขนานแกน x (Horizontal line test) ถ้าตัดกราฟเกิน 1 จุด = ไม่หนึ่งต่อหนึ่ง - ทั่วถึง (onto): ทุก y ใน B ต้องถูกแมปมาจาก x อย่างน้อยหนึ่งค่า วิธีเช็ก: ต้องรู้ “โคโดเมน B” ก่อนเสมอ แล้วดูว่าเรนจ์ครอบคลุม B หมดไหม 4) ฟังก์ชันประกอบ (f∘g) ที่ชอบออกสอบ - (f∘g)(x)=f(g(x)) ทำในวงเล็บด้านในก่อน - เงื่อนไขโดเมนของ f∘g: x ต้องอยู่ในโดเมนของ g และ g(x) ต้องอยู่ในโดเมนของ f ด้วย ทริค: ทำโดเมนทีละชั้น จะไม่พลาดเงื่อนไขราก/เศษส่วน/ลอค 5) อินเวอร์สของฟังก์ชัน (f^{-1}) - จะมีอินเวอร์สได้ “ต้องเป็นฟังก์ชันหนึ่งต่อหนึ่ง” (ถ้าไม่หนึ่งต่อหนึ่ง ต้องจำกัดโดเมนก่อน) วิธีหาอินเวอร์สที่ใช้บ่อย: 1) ตั้ง y=f(x) 2) สลับ x กับ y 3) แก้สมการหา y 4) เขียนเป็น f^{-1}(x) และเช็กโดเมน-เรนจ์สลับกัน ถ้าอ่านสรุปแล้วอยากทำให้คล่อง แนะนำทำโจทย์สั้น ๆ หลังแต่ละหัวข้อ: หาโดเมน/เรนจ์ 3 ข้อ, เช็กเป็นฟังก์ชัน 3 ข้อ, หา f∘g 2 ข้อ, หาอินเวอร์ส 2 ข้อ จะช่วยให้จำได้ไวและไม่หลุดเงื่อนไขตอนสอบ

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An Apple Pencil is shown drawing a box around the handwritten text "Plan out content for February" on a digital planner in GoodNotes. Overlay text instructs to draw a box around the text to adjust.
Use the Lasso Tool to Adjust Handwriting
The lasso tool has a ton of great functions in Good Notes, but one of my favorites is that you can use it to adjust the text size to fit certain spaces in your planner. Simply choose the lasso tool from the tool bar, draw a box around the writing you want to adjust and then use your Apple Pencil to
Ashley✨

Ashley✨

34 likes

A couple embraces in a vast, barren landscape under a clear blue sky, with mountains in the distance. Overlay text reads "The Hard truths ADHD + Relationships," highlighting the article's focus on challenges in relationships with ADHD.
A smiling couple, wearing matching race shirts and medals, stands outdoors after an event. Overlay text states "Communication is Key" and emphasizes that partners without ADHD may not understand the struggles, underscoring the need for communication.
A couple kisses under tall pine trees. Overlay text discusses the importance of communicating ADHD needs and brain function to a partner, especially when unintentionally saying hurtful things, to build a successful relationship.
🧠ADHD + Relationships: The Hard truths
Hi friends💖 I don’t think a lot of the world understands how hard it is to maintain relationships as someone with ADHD. Not saying everyone with ADHD experiences the same things, but for me it’s very difficult. I notice a lot of the times my ADHD gets in the way of my romantic relationship
Bruna Bueno

Bruna Bueno

26 likes

STUDY LIKE AN IT GIRL
#studygirl #studyingvibes #femalestudent #studyaesthetic #studylikeacollegestudent
🤍 𝐭𝐫𝐞𝐧𝐝𝐲 𝐠𝐢𝐫𝐥𝐲 🤍

🤍 𝐭𝐫𝐞𝐧𝐝𝐲 𝐠𝐢𝐫𝐥𝐲 🤍

1 like

Tips for iPad users! 📄
As an ipad girlie, PDFs are one of the things that make my life convenient. Did you know that I have several e-books with 1000+ pages? Imagine carrying all of them, my back would really suffer. Here’s how I study my PDF files efficiently! #lemon8partner #ebooks #ipad #notes #learnon
teal.days

teal.days

276 likes

An illustration of the human brain, highlighting and labeling the four main lobes: Frontal (purple), Parietal (light blue), Temporal (green), and Occipital (yellow), to introduce their different functions.
An illustration of the brain with the frontal lobe highlighted, detailing its functions including motor control, problem-solving, and expressive speech via Broca's Area.
An illustration of the brain with the parietal lobe highlighted, outlining its functions such as sensation and spatial and visual perception.
🧠 Brain Lobe Functions
Understanding the functions of the brain's lobes is crucial for assessing neurological health. Here's a brief overview:⁠ ⁠ 1️⃣ Frontal Lobe:⁠ ⁠ Location: Front of the brain.⁠ Functions: Involved in decision making, problem-solving, control of purposeful behaviors, consciousness, and em
Nurse Well Versed

Nurse Well Versed

1475 likes

So simple and easy to do works and functions great
Such a great easy diy so simple and you can customize to any style and color you like great for those little corners in your yard or on your porch #letschat #lemon8challenge
Vsamerson #DIY V-Clips

Vsamerson #DIY V-Clips

397 likes

A handwritten educational diagram titled 'Cell Organelles and Their Functions' lists eight organelles with their roles. Below, a hand-drawn cell illustrates and labels the Nucleus, Mitochondria, Ribosomes, Endoplasmic Reticulum, Golgi, Lysosome, Vacuole, and Chloroplast.
Cell organelles and their functions
Working full-time but still in school? I help busy students handle online exams, assignments, essays, TEAS, WGU,HESI and proctored tests without the stress. DM to learn more 📩 #cell #nursing #study #nursingstudent #medstudent
GetHelpWithProctoredExam

GetHelpWithProctoredExam

19 likes

A student looking stressed while studying, with an open textbook, calculator, and notes. Overlay text reads: "How to raise your GPA," "MANAGE YOUR ASSIGNMENTS WITH EASE," "Nursing Student Edition," and "From a 4.0 Student!!"
An open planner with handwritten notes and highlighters. Overlay text promotes "LEVERAGE SPACED REPETITION," explaining that neural connections strengthen with repeated exposure and advises daily review of concepts, focusing on lab values, pharmacology, and disease signs/symptoms.
A laptop and an open notebook with handwritten notes and a Hello Kitty bookmark. Overlay text introduces "DUAL ENCODING," suggesting combining visual and verbal inputs by adding diagrams to notes and relating drawings to written paragraphs for better retention.
Nursing School Made Easy (or at least Easier) ?
Nursing School is notorious for all of the information that you need to consume in a short period of time! It can be easy to burn yourself out and not have enough time to complete everything to your satisfaction. However there are times where you have to pick the most important material and just st
Stella Studies

Stella Studies

21 likes

A whiteboard illustrates a math/physics study method with a problem, solution, and notes. The question is in green, solution in blue, formula explanations in orange, and related concepts in purple. Black numbers list problems for review, aligning with the 'review question, work + answer, explanation, extra notes on the topic, problems to review' labels.
studying for math based subjects🫶
Sometimes studying for math heavy subjects like physics, chemistry, and engineering can be difficult because there’s not really notes to study and doing practice problems over and over doesn’t always prepare you for all the possible questions that will be on the test. This is the study method I
reagan

reagan

34 likes

Drawn to toxic relationships? Read this!
There were two chapters that I found extremely helpful in this one! Chapter 6 and Chapter 8 Sometimes we are drawn to toxic people. Sometimes we don’t feel worth to let good people stay in our lives. #toxicpeople #relationship #relationshipadvice #healing #friends
A Better Life

A Better Life

10 likes

A hand holds the book 'Your Money or Your Life' by Joe Dominguez and Vicki Robin, featuring a dollar bill with birds on the cover, against a bookshelf background.
A book page titled 'WHY READ THIS BOOK?' lists 10 highlighted questions for self-reflection on money, time, job satisfaction, and overall life fulfillment.
A book page highlights text about 'We Aren't Making a Living, We're Making a Dying,' describing how money dominates waking hours for many workers.
Still trading your life for a paycheck you hate?
Wake up.Your Money or Your Life isn’t just a book—it’s a blueprint to break the cycle. Read it. Rethink everything. #money #financialhealth #reading #donotwasteyourmoney #Lemon8
Read With Bintou

Read With Bintou

18 likes

Aesthetic Note-Taking Methods That Actually Work!
I used to think aesthetic notes were just for vibes... until I realized they actually helped me remember stuff better 🤯. Once I started using the Cornell method, everything clicked. Splitting the page into cues, notes, and a summary made my study sessions feel way more organized. It’s so much easie
CompSkyy

CompSkyy

17 likes

🍋✨Brain Functions✨🍋
⸻ ✨ Protect your peace like it’s gold—because it is. 🧠 Here’s what they don’t tell you: Your brain remembers everything—pain, energy, silence, chaos. That’s why I set boundaries, take breaks, and talk to myself softly. Call it self-care. Call it rewiring. Either way, I’m choosing peace on p
Solana Mottola

Solana Mottola

467 likes

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