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数学 高校生

(3)の上から3.4行目の式変形を教えてください

(2) スース |a|は|aPとして扱う laド=aa . 次の値を求めよ。 (3) 2 基本 CHARTOSOLUTION Q, F 動 69 求め 複素数の絶対値 (1) 2z=|zP (3)(1), (2) の結果から, zについての2次方程式を導き, 解く 別解 =a+bi (a, bは実数)とおき, a, bの値を求める。 (2)(z+i)(z+i)=|2+i} の利用。 CH- 解答 (1) zz=|2P=1°=1 (2) |z+il=V3から |z+if=3 8=(+2)(2+2) 3( よって T ztポ=(2+il2i 2+i=z+i=z-i すなわち (z+i)(z-i)=3 のlaP= 展開すると スス=1 を代入して整理すると 22-iz+iz+1=3 合=-1 i(z-z)=-1 i6+%=id-o 3実対s 0 よって スース=ー a+B (3) えキ0 であるから,(1)の結果より マミ! 合 2|=1 から zキ0 の. |2|=1 のとき,z==0 これを(2)の結果に代入して 1 スーニ=i る 分母 よっ 2 関係はよく利用される。 o立知象 0 0- さ E 0キ6 0 022 (2-- すなわち ーー2 両辺にえを掛けて整理すると 2-iz-1=0 +E よって(2ー)-()-1-0 また 3 ゆえに 2 0 V3 1 V3 1 したがって マミー 2 2 2 2 Ta, 6は実数」の断りは 重要。 IN 別解 2=a+bi (a, bは実数)とおく。 ス=a-bi であるから スース=a+bi- (α-bi)=2bi 上 値 1 4 (2)より,zーz=i であるから 6= 2 26i=i Q また,|z|=1 であるから a°+6°=1 l2パ=a'+6° こ 3 6= を代入してa= V3 よって Qミ+y3 よ 4 したがって 2 2 2 -=2 2 Pi PRACTICE…6 ナ |a|=5 かつ |z +5|=2/5 を満たす複素数 いて,次の値を求めよ。

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英語 高校生

英語の長文です! わかる方お願いします

ロ文型/文の種類 社会 1 25 rh Chapter Time: 35 mnutes 1 英文を読んで、設間に答えなさい。 Most important easons for doing voluntecr work Number of hous students volunteered per month 1%of students help people or community 44% 104 eam something new 24% Sto 10 get work eperience 20% 11 or more other 12% St. Martin's High School conducts a survey of student volunteer work 。 every year. The survey results show that many students have positive atitudes toward volunteering. The graph above shows the average amount of time that students spent doing volunteer work per month in this year. The table s shows the most important reasons given for participating. The teachers at the school have encouraged their students to volunteer since 2009. Before then, few students did volunteer work. When Brian Amster, the present principal, first came to the school in 2008, he found that there was litle communication among students, their families, and the 10 Community. As St. Martin's High School was in a newly developed arca, more than half of the students and their families were newcomers, and they did not know cach other or the area very well. Mr. Amster thought this was not good for the students and the communiry. Mr. Amster came up with the idea of volunteer work. p He wanted his の 15 students to have more contact with the local people through helping those in need. The local people really welcomed the volunteer activities. Volunteering gave many students a chance to learn a lot, and their self-esteem improved. It was good for the community and the students themselves, too. Mr. Amster says, "In the beginning, most of the volunteer activities 4 20 involved helping old people. Today, however, more and more students are doing activities related to the environment, such as cleaning parks and other public areas. Parents are also encouraged to help, and cach year, more and more parents are participating." One thing that makes Mr. Amster especially proud is that most students continue voluntering even after graduation. さ

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英語 中学生

私の解答で単語が間違っていたんですけど、2点満点中だと0点になりますか?

(北海道 30年度 3 次のA, Bに答えなさい。 A 書いたものです。これを読んで, 問いに答えなさい。 a coffee shop. I *looked forward to visiting there. At the airport, I was very glad took me to her shop, but it was closed. She smiled at me and said, "In summer, many 「customers came to enjoy drinking coffee, but the number of customers *decreased during winter. So I have to close my shop now. Reality bites, but I'll open my shop again next meet her. Before we went to her house. Nin。 summer.” 1OY On the last day of my stay, Nina told me about her dream. She wants to buy many kinds of food, such as chocolates and *coffee beans from developing countries. She also wants to sell them *at the right price. She said to me, “Making people's lives in developing countries better is my dream.” Next summer, I want to help Nina with her work. (注) look forward to ~を楽しみに待つ customer (s)客 decrease 減少する T! at the right price 適正な価格で coffee bean (s) コーヒー豆 問1 本文の内容から考えて, に入る適当な1語を書きなさい。 問2 下線部 Reality bites は, 本文中でどのような意味で使われていますか, 最も適当なもの を,ア~エから選びなさい。 ア Winter is better than summer イ It's harder than I thought ウ Everything is good for me エ People around my shop are friendly 赤日の 文 本聞 ラルチ 問3 本文の内容から考えて, 次の問いに対する答えを,主語と動詞を含む英文1文で書きな さい。 Why does Nina want to sell many kinds of fo0d from developing countries at the right price?

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