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数学 高校生

1枚目の(3)と2枚目の問題の違いを教えて欲しいです。2枚目の解説では(i)の場合分けがあるのに対して1枚目ではそのような場合分けがないのはなぜですか? 書き込みで見にくくなっていてすみません🙇‍♀️

よ女わら Dco (はhいいしあのと グラフを方程式へ応用していく代表的なもので, 今後, 数学II.Bへと学習が 2次方程式 r2-2az+4=0 が次の条件をみたすようなaの範 このように,方程式の解を特定の範囲に押し込むことを「解の配置」といい、 解の条件を使って係数の関係式を求めるときは, グラフを利用しま 囲をそれぞれ定めよ。 62解がともに1より大きい。 注 「異なる2解」とかいていないときは重解の場合も含めて考えます。 f(z)=0 の1つの解が1より大きく,他の解 =f(x) の よって、f(1)=5-2a<0 この場合,精調D, Oは不要です. a> 2 2解がともに0と 3の間にある。 2解が0と2の間と2と4の間に1つずっある 注 f(x)=0 の2解がともに0と3の間にあると き、y=f(x)のグラフは右図. よって,次の連立不等式が成立する。 f(0)=4>0 f(3)=13-6a>0 |0<a<3 タ14-as0 よって,a< かつ0<a<3かつ「aニ-2 または2Sa」 リ=f(x) 4 精|講 4精講の 精講の 0.3 -4-a あるrの値に対するyの値の符号 軸の動きうる範囲 ③ 頂点のy座標(または, 判別式)の符号 精講の flo)20 {い))o 2) 精講の fa)co 13 6 13 下図の数直線より, 2Sa<- 6 すすんでいっても使う考え方です。 確実にマスターしてください 解 答 213 3 6 -2 0 a k(z)=z-2ar+4 とおくと, f(z)=(z-a)+4-a リ=f(x) (4) f(0)>0, f(2) <0, f(4)>0 が成りたつので よって,軸はエ=a, 頂点は(a, 4-a") (1) f(x)=0 の2解が1より大きいとき y=f(x) のグラフは右図のようになっている. よって,次の連立不等式が成立する。 S(1)=5-2a>0 ae [S (0)=4>0 04 リ=fla) (2ca) f(2)=8-4a<0 5 よって,2<a<。 2 0 4エ f(4)=20-8a>0 世 a (精講の ポイント 精講の 解の配置の問題はグラフで考える D>0 -4-a -aE0 射な精講③, 次ページ右上の国 aく;かつ1<aかっ 532 「aS-2または2ma」 右図の数直線より, 2<a<- 2 25 演習問題 45 2次方程式 4c-2mz+n=0 の2解がともに, 0<ェ<L まれるような自然数 m, nを求めよ。 第2章 B6l2

解決済み 回答数: 1
英語 高校生

1枚目右ページの2行目、a patexted technology involving bacteria cleans the water, はinvolving bacteriaがa patented technologyを現在分詞の形で修飾していて、cleansが文の... 続きを読む

They are part of an experiment that Sogo, chief operating officer at FRD Japan, hopes will one day allow cost-effective inland farming of salmon Tokyo, gray salmon in a tank make quick movements, fighting for food. sea, but businessman Tetsuro Sogo is looking inland to raise one of the country's most loved sushi fish: salmon.\ In a mountainous area near Japan may be an island nation surrounded by the richness of the A You are preparing for agroup presentation on fish farming for your elan thought we needed a new way to produce more salmon," he explained. The company's process has two stages. First, tap water is converted 58 第2回 実戦問題 59 第6問 (配点 24) a シフト You have found the article below. 文字サイズ マトリー ジャンプ salmon farming. and enable Japanese to buy the homegrown fish for their sushi. “"We'll able to easily get high quality salmon wherever we are,” Sogo said The majority of the salmon consumed worldwide is farmed, not wila technology exports)." and the aquaculture market is dominated by Norway, which produces 1.3 million tonsa year. Farming at sea, the most common way to raise the fish, is complicated. The sea must be the right temperature, colder than 20 degrees Celsius, and only areas without strong waves and currents are tons of sushi-ready salmon. suitable - normally inlets or bays. Inland farming of salmon is often an impractical, expensive venture requiring lots of water and electricity to keep tanks clean. That hasn't stopped demand from exploding since the 1980s, with the United States, Russia, Europe, and Japan all fussing about the fish's rich pink flesh, according to the World Wildlife Fund. “Supply is not catching up with the growing demand," said Sogo, speaking at his test focility in Saitama, 50 km (31 miles) from the sea. Dressed in a suit like 35 明1 According to the article, what is NOT true about samon farmine? 0 Itis not easy to make profit by inland farming. の More than halfof the salmon consumed in the world comes from farming. Norway is leading the world market. a typical “salaryman" corefully monitors the fish as though he is wWatching his own children ““We - except fora pair of white rubber bonts _ Sogo O Strong waves are necessary to keep the water clean. 「第2回

解決済み 回答数: 1
英語 高校生

問2について 答えは②らしいのですが、どうしても納得いきません。本文では、「現金を引き出すことは不便で危険だ」と言っていますが、「クレジットカードが便利で安全だと思う」なんて一言も書かれていません。 どなたか納得のいく説明お願いします🙏🏻

Change May Come to Denmark's Cash By Sandra Gray, Copenhagen March 8, 2020· 1:25PM enbbots Cash may be on the way out, in Denmark, where credit card and mobile pavments have been adopted_widely and have become more popular than old-fashioned cash payments. Figures from 2019 show that last year only 16 percent of ordinary store payments were made in cash! The government is now considering a proposal to allow businesses such as restaurants, convenience stores and clothing stores to refuse cash payments) Dana Hasbrook of Copenhagen is looking forward to a_cashless_society. and savs, Having to withdraw money is inconvenient and _risky." Police officer Peter Nielson also supports the proposal. "Criminals won't be able to steal money from stores anymore, which will make my job easier." Not everyone is happy about a world without cash, however. /…This is a double-edged sword. Certainly, people's wallets will be lighter, but what happens when there's a problem with the system that processes credit card and mobile payments?” says Mary Daniels, a schoolteacher. “Also, when you use a credit card at a store, staff members can see your name. People shouldn't have to give out their personal information for the sake of convenience."

解決済み 回答数: 2