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📘 The two-variable equation system is not as difficult as it seems.

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... Read moreถ้าใครค้นหา “วิธีแก้สมการ 2 ตัวแปร” แล้วเจอว่ายุ่งยาก แนะนำให้ยึด 1 เทคนิคหลักให้แม่นก่อนเลย คือ “เทคนิคการแก้ระบบสมการ 2 ตัวแปรด้วยการกำจัดตัวแปร (Elimination)” เพราะเป็นวิธีที่ออกสอบบ่อยและทำได้เป็นขั้นตอนแบบมีเหตุผล หลักคิดสั้นๆ (ที่ผมใช้สอน/ใช้ทำโจทย์เอง) 1) เลือกก่อนว่าอยากกำจัดตัวแปรไหน (x หรือ y) → เลือกตัวที่ทำให้ทำสัมประสิทธิ์ให้เท่ากันได้ง่าย 2) ทำ “สัมประสิทธิ์ของตัวแปรที่จะกำจัด” ให้เท่ากันก่อน โดยคูณทั้งสมการ (ห้ามคูณแค่บางพจน์) 3) ดูเครื่องหมายหน้าตัวแปรนั้นๆ - ถ้าเครื่องหมาย “เหมือนกัน” → เอาสมการมาลบกัน - ถ้าเครื่องหมาย “ต่างกัน” → เอาสมการมาบวกกัน 4) จะเหลือตัวแปรเดียวให้แก้ได้ทันที แล้วนำค่าที่ได้ไปแทนกลับ (Substitution) เพื่อหาอีกตัว 5) สุดท้ายตรวจคำตอบ โดยแทนกลับทั้ง 2 สมการ (กันพลาดเรื่องเครื่องหมาย) ตัวอย่างเร็วๆ (แนวที่เจอบ่อย) (1) 2x - 3y = 9 (2) x + y = 2 ผมอยากกำจัด x เพราะทำให้เท่ากันง่าย: คูณ (2) ด้วย 2 ได้ (2') 2x + 2y = 4 ตอนนี้ x มีเครื่องหมาย “เหมือนกัน” (ทั้งคู่เป็น +2x) → ใช้วิธี “ลบ” (1) - (2') : (2x - 3y) - (2x + 2y) = 9 - 4 ได้ -5y = 5 → y = -1 แทนกลับใน (2): x + (-1) = 2 → x = 3 ตรวจ: 2(3) - 3(-1) = 6 + 3 = 9 ถูก ทริคกันหลงที่ช่วยได้จริง - ก่อนบวก/ลบ แนะนำใส่วงเล็บทั้งสมการที่เอามาลบ เช่น (1) - (2') แล้วกระจายเครื่องหมายลบให้ครบ จะลดความผิดพลาดเรื่อง “ลบแล้วลืมเปลี่ยนเครื่องหมาย” - ถ้าสัมประสิทธิ์เป็นตัวเลขใหญ่ ให้มองหา ค.ร.น. ของสัมประสิทธิ์ เช่น x มี 3 กับ 2 → ทำให้เป็น 6 โดยคูณ 2 และ 3 จะไวสุด - โจทย์บางคนชอบถามต่อว่า “สมการกำลังสองตัวแปรเดียว” ให้ระวังว่าเป็นคนละเรื่องกับ “ระบบสมการ 2 ตัวแปร” แต่ทักษะจัดรูปสมการ/ย้ายข้าง/จัดวงเล็บให้เป๊ะๆ ยังจำเป็นเหมือนกัน สรุปคือ ถ้าจำได้แค่ 3 อย่าง: “ทำสัมประสิทธิ์ให้เท่ากัน → ดูเครื่องหมาย → เหมือนกันลบ ต่างกันบวก” คุณจะเริ่มแก้ระบบสมการ 2 ตัวแปรได้แบบไม่ต้องเดา และทำโจทย์สอบได้มั่นใจขึ้นมาก

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Chalie_Baker

Chalie_Baker

226 likes

A math cheat sheet titled 'PROPERTIES OF INTEGERS' detailing Closure, Commutative, Associative, Distributive, Identity, and Inverse properties with definitions, formulas, and examples for addition, subtraction, and multiplication.
A math cheat sheet titled 'LINEAR EQUATIONS KEY FORMULAS' presenting Slope-Intercept, Point-Slope, Standard, Two-Point, Slope, and General Linear Equation forms, each with formulas, descriptions, and examples.
A math cheat sheet summarizing key concepts for Real Numbers, Polynomials, Pair of Linear Equations, Quadratic Equations, Arithmetic Progression, and Triangles, including formulas and theorems.
math cheat sheets1
#mathtips #math #maths #mathideas
ReissSparkles🖤

ReissSparkles🖤

36 likes

A male teacher points to a whiteboard displaying a solved word problem: 'Twice a number increased by 12 equals 26,' with the solution x=7. Key problem-solving steps and a 'Mathematics is Logic, Precision, Patience, Practice, Success' poster are also visible, with students observing.
Word problem leading to simple equation
Generated by AI
Patrick Oni

Patrick Oni

2 likes

A title slide for 'DOSAGE CALCULATION QUESTIONS' with a prescription symbol and a pill bottle containing yellow pills, indicating a series of medical math problems.
A dosage calculation problem asking to find the volume to administer for 0.25 mg ordered dose with 2 mg/mL strength. It outlines conversion, formula setup, but the solution is obscured by pill graphics.
The solution to a dosage calculation problem, showing the ordered dose of 0.25 mg and available strength of 2 mg/mL, resulting in a calculated volume to administer of 0.125 mL.
Can you get them all correct ?
Oh Dosage Cal ! How we have a love hate relationship with you. You seem so unnecessarily extra sometimes yet you also know how to give me a boost on my exams when I may struggle ( shout out to the easy dosage calculation questions that seldomly appear). Give these a try ! How’d you do ?
Your Nursing Bestie Destinee

Your Nursing Bestie Destinee

239 likes

MCAT Gen Chem🧪🔬
Kaplan Gen Chem quicksheets #studymedicine #premed #STEM #chemistry #MCAT #Lemon8Diary #SCIENCE
Future Dr. 🥼🩺

Future Dr. 🥼🩺

27 likes

A hand holds a stylus over an iPad displaying digital notes on linear algebra, including RREF, Gaussian Elimination, and matrix examples. The screen shows detailed mathematical concepts and calculations, illustrating effective digital note-taking for studying.
A spiral-bound notebook with handwritten notes on programming project modules, structs, and lists. The notes are color-coded with different pens and a blue highlighter, demonstrating the use of color for organization and highlighting key points.
An iPad displaying digital notes on Bernoulli trials, probability mass functions, and binomial calculator functions. The notes include formulas, definitions, and a bar chart, showcasing the use of visual aids for better understanding complex concepts.
Take The BEST Notes Ever!
Taking good notes isn’t just about writing things down—it’s about turning them into a tool that makes studying easier and actually enjoyable. Here are three simple ways to level up your note-taking game and make your notes pop! First, color-code your notes. This isn’t just about making them pret
CompSkyy

CompSkyy

213 likes

A handwritten note-taking template titled 'TEXTBOOK NOTES' on lined paper, outlining sections for '1.1 Section Header', 'Heading' with content and vocabulary, 'Subheading' with content and important concepts, and an example chemical equation. The notes use various colored pens for organization.
my note-taking system for textbook readings!
if there is a single person out there that actually enjoys doing textbook reading…i envy you. but it’s necessary! so i’ve come up with a little system to make things colorful and fun. (side note i swear subheading is orange it just looks super pink on camera lol) #study #studytips #notes
Kyrie

Kyrie

108 likes

An iPad screen displays the 'School Assistant' app dashboard, showing assignments, classes, and resources for Sunday, January 26, with a 'Hi Julia..!' greeting.
An iPad screen shows the 'Quizlet' app interface, featuring study guides, sets, and a calendar, with an achievement icon and a 'Start' button for learning.
An iPad screen displays the 'Question AI' app, showing a step-by-step solution to a math problem involving price calculation, with options for re-answer and upgrade.
Shool Assistant
IPAD NOTES FOR HIGH SCHOOL STUDENTS 📚💗——School assistant Shows you your assignment the due date and time. You can copy notes on it to -Quizlet Helps with study guide, flash cards and test for any subject -Question ai Helps you solve any questions with steps and answers any questions in any su
𝐉𝐮𝐥𝐢𝐚💗

𝐉𝐮𝐥𝐢𝐚💗

14 likes

Budget with me as a 30+ Digital Support Rep 🌸
I was never bad with money 💸 I just never had a plan for it and then one day ENOUGH was clearly ENOUGH! Girl I was overworked, stressed, and my nervous system would panic 🙀 when I needed to make a financial decision. Working multiple jobs + Side hustles and the bills were still running behi
Lyntrina |Your Budgeting Sis

Lyntrina |Your Budgeting Sis

9 likes

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