Grade

Type of questions

Mathematics Senior High

(2)の問題で、符号が変わる理由が分からないです。 教えてほしいです。

OOOO0 基本例題15 因数分解(対称式·交代式) (2)鹿児島経大) 次の式を因数分解せよ。 (1) a(b+c)°+6(c+a)°+c(a+6)?-4abc (2) x(y-)+y(z?-x)+z(x°-y) 基本13,14 CHART 対称式·交代式の因数分解 1つの文字について降べきの順に整理する どの文字についても次数は同じ。どれか1つの文字に着目して整理する。 lOLUTION aについて降べきの順に整 理する。 (1) a(b+c)+b(c+a)°+c(a+b)?-4abc =a(b+c)+6(c+2ca+a°)+c(a"+2ab+6°)-4abc =(b+c)a+{(6+c)"+2bc+2bc-4bc}a+bc2+6°c =(b+c)a+(b+c)°a+bc(b+c) =(b+c){a°+(b+c)a+bc} =(b+c)(a+b)(a+c) =(a+b)(b+c)(c+a) *(b+c)が共通因数。 *これを答えとしてもよい。 中輪環の順に整理。 xについて降べきの順に整 理する。 =(-y+z)x+(y°-z")x+yz?-y =ー(y-z)x°+(y+z)(y-z)x-yz(y-z) =ー(y-2){x°-(y+z)x土yz} =ー(y-z)(x-y)(x-z) =(x-y)(y-z)(a-x) *(y-z)が共通因数。 *これを答えとしてもよい *輪環の順に整理。 INFORMATION 3つの文字についての式は,なるべく 輪環の順に書くようにすると 式が見やすく,書き落としや間違いを防ぐことができる。 和:a+b→b+c→c+a 差:a-b→b-c→c-a 積:ab→ bc→ ca PRACTICE (4)超川大 15° 次の式を因数分解せよ。 (1) a'b+ab°+a+b-ab-1 (2) x(y-1)+y(1-x)+x-y (3) a(b-c)+b(c-a)+c'(a-b) (4) a(b+c)+b(c+a)+c'(a+b)+2abc

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TOEIC・English Undergraduate

1から9までを埋めなければならないのですが、質問の意味もよくわからず…。どなたか質問の意味と解き方を教えて頂けると助かります…!

Vocabulary skills: Collocations Read the text. Then find verbs that collocate with the words and phrases below. Write the infinitive of each verb. KEY VOCABULARY SKILLS STUDY SHEET 7, PAGE 164 The Duke of Edinburgh’'s Award The Duke of Edinburgh's Award (known as the DofE) began in the U.K. in 1956. It gives young people from all backgrounds an opportunity to experience challenge and adventure, acquire new skills, and make new friends. Each year, participants between the ages of 14 and 24 complete many hours of voluntary community work. There are three levels: Bronze, Silver, and Gold. Each one requires increasing commitment, so you can choose which level is best for you. There are four sections at Bronze and Silver level, and five at Gold. These sections combine practical, cultural, and adventurous activities. Achieving a Duke of Edinburgh's Award helps young people to develop a sense of responsibility, and promotes values of persistence, commitment, and enterprise. It has a lasting impact on young people's behavior, skils, and life chances. In 1988, the DofE was expanded to become international. These days, over 635,000 participants around the world are achieving a DofE at any one time. Since the DofE began, Over six million young people in over 123 countries have taken part, and it continues to grow in popularity. 1 an appointment / small talk / progress success / your goals / independence dark / older / crops 2 4 a course / a form / an exercise someone a chance / a talk / feedback 5 awareness / growth / competition a qualification / knowledge / a reputation for something a problem / dificulty / something at first hand a friendship / a taste for something / an idea 6 7 8 9 Predicting Look at the title of the information sheet you’re going to read. Discus with a partner what. think you'll read about. Gnbal Youth Service Day

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