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数学 中学生

青線部の5秒後っというのは、どうやって求めたのですか?

B Pを P, を 表 7 4章 関数y=ax² 6章 円 5章 相似な図形 7章 三平方の定理 8章 標本調査 2章 平方根 3章 2次方程式 秒後 ここで定着 右の図のような直 角三角形ABCで、点P は,Aを出発して毎秒 15cm 2cmの速さで辺AB 上をBまで動く。 また. 点Qは点Pと同時に Aを出発して毎秒 3cmの速さで辺AC上をCまで動く。点P, Qが出発してからェ秒後の△APQの面積を ycm² として,次の問いに答えなさい。 (1) AP, AQ それぞれの長さを、xを使って表 しなさい。 1 Q A P→ 点Pは,Aを出発して毎秒2cmの速さで動くから、 秒後のAPの長さは、AP=2×ェ=2x(cm) 点Qは,Aを出発して毎秒3cmの速さで動くから, 秒後のAQの長さは, AQ=3×x=3x(cm) AP 2x cm ($1x=3 (8 -10cm (2)yをxの式で表しなさい。 (△APQの面積) 1 =1/2×(辺APの長さ)×(辺AQの長さ)だから, y=-1⁄2×2x×3x y=3x² IC ROM: (3) x=2のときのyの値を求めなさい。 y=3x² にx=2を代入すると, y=3×22=12 28 y=3x² は 0≦x≦5では, x=0のとき, 最小値0 x=5のとき, 最大値75 B AQ 3.x cm 答y=3x2 答 + プラス (4) △APQの面積が27cm²になるのは,点P, Qが出発してから何秒後かを求めなさい。 y=3x² にy=27を代入すると, 27=3x2 x2=9 x=±3 x>0だから、 y=12 0≦x≦5 2章 平方根 3章 2次方程式 JUŠARSREO SAOA (8) 4章 関数y=ax (5) xとyの変域をそれぞれ求めなさい。AOA 点PはBに,点QはCに5秒後に着くから、 0≤x≤5 SHANT 3秒後0△ 5章 相似な図形 y 0≤y≤75 6章 円 7章 三平方の定理 8章 本 3 年 77

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英語 高校生

共通テストで8割以上取りたいと思っている高校生です。 写真はシステム英単語の一部を撮ったものなのですが、 赤のところは勿論、どこまで覚えるべきでしょうか?

588 MINIMAL PHRASES 587 REIS an extremely difficult problem [ikstrí:mli] ■gradually become colder [grédzuali] ◇grádual 589 || instantly recognizable songs [ínstantli] 592 流動的 extrémeotie 同? > instant 同? 591 He's kind; moreover, he's strong. [mo:róuver] = fúrthermore 流な nonetheléss relatively few people [rélativli] 590 He is rich; nevertheless he is unhappy. 彼は金持ちだが,それにもかか [nevardalés] わらず、不幸だ = compáratively ◇ rélative 593 Dan apparently simple question (アク?) = ★ Apparently he is old. It appears that he is old. >appárent Q訳しなさい。 1) The difference became apparent. 2) the apparent difference それにも関わる 非常に難しい問題 形極端な、過激な極端 amoal だんだん冷たくなる 形徐々の、段階的な vinidedong すぐにそれとわかる歌 (=immediately) 名瞬間 形瞬時の それにもかかわらず 彼は親切で、その上強い (=besides) その上、さらに,しかも 比較的少数の人々 相対的に 副比較的 相対的な比較上の名親せき 一見簡単な問題 [aparantli] 見たところでは 形①明らかだ ② 外見上の、うわべ ★補語は①の意。名詞限定では ② が多い。 A 1) 「違いが明 594 595 59 C (1 5

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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