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英語 高校生

(24)の答えがなぜ1になるか分からないです…

(24) The Tale of Mejk Swenekafew Recently, many people have been talking about "fake news" news reports that are untrue. However, such reports have been around for a long time. They are sometimes used in order to get more people to read newspapers, watch TV programs, or visit online news sites. People also use fake news to spread their political or religious beliefs. However, ( 24 ) publishing fake news. In 1903 in the city of Clarksburg, West Virginia, fake news was used to check/if newspaper was really writing its own articles. In the city, there were two rival newspapers, the Clarksburg Daily Telegram and the Clarksburg Daily News. The Daily Telegram's staff believed that the Daily News's reporters were ( 25 ). The Daily Telegram decided to check whether this was happening. It published a fake news story about a man who had been shot after an argument about a dog. The man's name was Mejk Swenekafew. Soon afterward, exactly the same news appeared in the Daily News. However, the reporters at the Daily News had not noticed that the name "Swenekafew" was actually "we fake news" written backward. They were forced to admit that they had copied the Daily Telegram's article. These days, there is more pressure than ever on newspapers, news programs, and news websites to get more readers, viewers, and visitors. In order to do so, they need to report big news stories as quickly as possible. ( 26 ), they are constantly watching each other to make sure they have the latest stories. However, they need to be careful not to do the same thing that the Clarksburg Daily News did. these are not the only reasons for many popular websites have been there are rules to stop people from some TV companies began by a

未解決 回答数: 1
英語 高校生

(21)の答えが3になるのがなんでか少し分からないです…わかる方いますか??

(21) (22) (23) Any Change? Long ago, humans did not use money. Because they often could not produce everything that they needed, they traded some of their goods for goods made by others. Gradually, the goods that they exchanged were replaced by cash. For hundreds of years, metal coins and paper bills that can be exchanged for goods and services have been produced. Cash is convenient for many people because it is easy to carry. At the same time, though, it ( 21 ). Another disadvantage is that criminals have been able to produce fake coins and bills. In the middle of the 20th century, plastic credit cards were introduced. They had security features to prevent them from being used by anyone except their owners. At first, their use was limited to wealthy people. Over time, however, they became ( 22 ). In the last few years, apps for smartphones that can be used in the same way as credit cards have also become popular. Because of this, some people are suggesting that we may soon see the end of cash. Supporters of a "cashless" society in which all payments are made electronically argue that it would have several benefits. For example, people would not have to worry about keeping their wallets safe. However, some people are concerned that they might be unable to pay for the things they need because of a software error or a broken smartphone. Moreover, some people do not have bank accounts or credit cards, so their only option is to use coins and bills. ( 23 ), it seems as though societies will continue to use cash. 1 can be lost or stolen can be recycled 1 thinner and lighter 3 harder to use 1 For now 2 Until then 2 4 2 4 3 is used for shopping online is understood by almost everyone more colorful and exciting more widely available With luck 4 By contrast

解決済み 回答数: 1
数学 高校生

数2 積分 (二次関数) (2)(iii)について写真二枚目の左下のインテグラルの外に3を出す作業について、これがなぜできるのか具体的に思い浮かべられません。 二次関数の合成でXの二乗の係数を外に出す、ということはやりましたがこれですか? また、これはなぜできるんでしょうか... 続きを読む

f(x)はその区間で単調に減少する 関数の符号と関数の増減 を用いて、f(x) の増減を調べればよい。 なお、f'(x)=3.x(x-2)の0sxs4における様 号は次のようになる. y=f(x) 0 [2] 積分法 【ⅡI型共通 必須問題】 (配点 50点) 2分法 e はα>1を満たす実数, b は実数とする. xy平面上に、2つの放物線 C:y=2x2, Cry=-x^+(5-c)x+6 がり 2 は,上の点P(1.2) を通る。 また、 P における C の接線を1とする。 (1) を を用いて表せ。 また, I の方程式を求 めよ. (2) C2 とで囲まれた領域をDとする. (i) C2 との交点のうち, P以外の点のx座 標をαを用いて表せ。 (Ⅱ) 領域Dの面積をSとするとき, Sをαを 用いて表せ 領域Dのうち、不等式 y≧2x" を満たす 領域をEとする。 領域の面積が4となる ようなaの値を求めよ. <設問別学力要素》 分野・内容 配点 50m [ 【配点】 (1) 12点 (2) 38点 (1) 8点 () 14点 () 16点 (2X4) (2) (2) 2 配点 (12) 18 〇 [4] 16 知識 思考力 技能 表現力 解答 C₁:y=2x². C₂y=-x²+(5-a)x+b において、 f(x)=2x², g(x)=−x² + (5—a)x+b とする。 (1) 2 が P(1,2)を通ることより。 g(1)=-1+5-a+b=2. b=α-2 f'(x)=4x より PにおけるCの接線の 方程式は, y-2-f(1)(x-1). y-2=4(x-1). y=4x-2. (2)(1) 以下、h(x)=4x-2 とする。 C₂y=g(x), :y=h(x) を連立してyを消去すると、 h(x)-g(x)=0. ***2 C2との共有点のx座標は、方程式 ② の実数解である。 h(x)-g(x)=(4x-2)-{x+(5−a)x+b} =x²+(a-1)x-a = (x+ a)(x-1) より ② の解は x=-ℓ. 1, このうち、 P 以外の点のx座標、すなわ ち, x=1を満たすものは x=-a. >>1より -α <1 である。 h(x)=g(x)=(x+a)(x-1) であるから asxsにおいて h(x)-g(x) ≤0 すなわち、 g(x)=h(x). よって、領域Dの面積Sは S=f(g(x)-h(x)}dx --f(x+ a)(x-1)dx

解決済み 回答数: 1