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数学 高校生

(2)なんですが、ab<0だけだと、x²−4X−4のときも含みますよね??これだと重解で異符号の獬は出なくてバツじゃないんですか?

2次方程式 x+2(a-3)x+a+330 の解が次の条件を満たすような定数a 例題 49 2次方程式の解の存在範囲 (1)島 0dOOO0 の値の範囲をそれぞれ求めよ。のと (1) 異なる2つの正の解をもつ (2)。異符号の解をもつ D.70 基本事項 4 大 CHART OSOLUTION 2次方程式の異なる2つの実数解α, Bの符号 >0 かつ B>0 → D>0, α+B>0, αB>0] αとBが異符号 → αB<0 解と係数の関係を用いて, α+B, aBをaを用いて表す。 解答 2+2(a-3)x+a+3=0 の2つの解を α, βとし,判別式をD とすると リ=(a-3)?-(a+3)=(a-1)(a-6) 解と係数の関係により (1) a, Bが異なる正の数であるための条件は,次の 0, 2, ③ が同時に成り立つことである。 a+B=-2(a-3), aB=a+3 D>0 ·0, α+B>0 2,"aB>0 …③ 0から a<1,6<a のちD 2から a<3 ③から a>-3 6 式81 4- の, 6, ⑥ の共通範囲を求めて (2) α, Bが異符号であるための条件は よって,求めるaの範囲は Da-0 となればよいか -3<a<1 -3 0S 13 6 a aB<0 合このとき, D>0 は、 +動産 立っている。 a<-3 18ト (1-)て 00-(p.704解説参照) であるから、 0S+(A+S-8p INFORMATION 2次関数のグラフを利用 f(x)=x°+2(a-3)x+a+3 のグラ フを利用すると,a<B として Dfx)+ー-(a-3) fx)+ 国 S 0 (軸の位置)>0 f(0)>0 (2)f(0)<0(カ.715 補足参照) O| @ B 1B く ン Poacmran C の

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英語 高校生

学校を休んでいて答えが分からないので教えてください。

4 Use the passive of the verbs in brackets and complete the sentences. [一→ L.1 mainly from the U.S.A. [import] (1) Soybeans (2) How much for your first job? [pay] [過去時制で) you (3) A new theater near the station now. [is building] (4) Identity badges by all visitors. [should wear] (5) The file ; it may have a virus. [mustn't open] 1(6) our new gym? It's amazing. [have shown] you (7) It 19) gad yooy nst (8) The teacher that the company will open a new factory in Malaysia. [say] [「~だそうだ」の意味に) vit all the people in this town. [know] (9) Her boss her latest report. [satisfy] by her teammates because of her leadership. [look up to] (10) Sarah is 5 Put the words in the right order. [→L.8] 9qy To eon (1) My aim in life ( novelist, become, a, to, is ). lood s mid ovsy (2) I believe this is ( a, to, good, take, approach ). 00 (3) It ( is, to, very, predict, difficult ) the result of this match. (4) Billy ( important, it, make, thinks, to ) a success of his life. (5) The shop assistant kindly ( operate, how, showed, to, me ) the machine. (6) My mother ( to, to, withdraw, went, the post office ) some money. (7) I had no ( in, on, to, rely, friends ) Canada. I felt very lonely. (8) I'm(to, the soccer team, that, know, excited ) will come to Japan. 6 Correct the following sentences which contain one error each. [総合問題] (1) The festival is much bigger than it would be ten years ago. (2) My sister may talk with Mr. Williams at the. party last night. (3) Children under the age of six do not allow in this large pool. (4) I can't lend you my digital camera because it's repairing this week. (5) They have been discussing about the topic for more than two hours. (6) Helen was very pleasing with her exam results. (7) She pretended to not know anything about the matter. (8) This dictionary is easy to use it, so I recommend it to my juniors.

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