システム英単語の第2章まではLEAPで言うとどこまでですか？教えてくださいお願いします。

解説を読んでも全然わかりません。例題７の解説をお願いします。出来れば丁寧に🙇

第2章 平面上のベクトル 交点の位置ベクトル 一般に,線分をmin に分けるとき, 全体を1 と考えると,実数tを用いて, m:n=t:(1-t) と表せる。たとえば, 3:2=1213 : 1/3=12/3(1-12/3) t 5 5 5 である。 例題 7 △ABCにおいて, 辺AB を 2:1に内分する点を M, 辺AC を 3:2に内分する点を N, 線分BN と CM の交点をPとする。 このとき, AP を AB=6, AC =c を使って表せ。 考え方 Pは線分BN と CM の交点であるから, ABN と AMC に注目 して AP を,こを使って2通りに表す。 解 BP:PN=s: (1-s), CP : PM=t: (1-t) とおくと, AP=(1-s) AB+sAN AP=(1-s)AB+sAN s+(1-s) =(1-s)6+³/-sc (1) A AP=(1-t)AC+tAM =(1-t)+1/31 MU 1-t 5 S P 3 2 (1-s)b+sc=t6+(1-1)č B 3 ここで60 ですとこが平行でないから、 0 74 ①,②より, 1-s=12/23t. 2/23s=1-t 5 これを解いて, S= t= 9' よって、AP=246+12/22 2/3 1 m m+n -n 3. 1-s N kb+lc=k'b+l'c ⇒ k=k', l=l' 20

解答を見ても面積Sの求め方がわかりません。解答の点Pのx座標を2t-8と置くところからわかりません。どなたか丁寧に教えて下さると助かります🙇🏻‍♂️

秒あたり2増加するように一定の速さで動く。 また、 同じ座標平面上にある点Qは点 座標平面上にある点Pは,点A(-8, 8) から出発して、 直線y=-x上をx座標が1 り 1 増加するように一定の速さで動く。 出発してから t秒後の2点P, Qを考える。 点Pとx座標が等しいx軸上の点をP', 点Qとx座標が等しいx軸上の点をQと 点Pが0に到達するのはt=ア のときである。 以下,0<t< ア で考える。 PがAを出発すると同時に原点Oから出発して,直線y=10x上を x 座標が1秒あた おく。 OPP' △OQQ'の面積の和Sをtで表せば, S=イセー ウエt+オカ となる。 これより0<t<アにおいては, t= でSは最小値 ケコサ ク をとる。次に,αを0<a<アー1を満たす定 数とする。以下, a≦t≦a+1におけるSの最小・最大について考える。 (1) Sがt= キ ス ソ で最小となるようなαの値の範囲は ≦a≦ である。 ク t チ (2) Sがt=α で最大となるようなaの値の範囲は0<a≦ である。 ツテ [類 13 センター試験本試]

2011年北海道大学の英作文の添削をおねがいします。questionCです。 字数が足りていませんが、それ以外の部分をおねがいします。

Australia, the United States, and urban India. Rend the following passage and answer questions A through C in English. while their wives work outside the home, Stay-at-home dads are also called stay- Stay-at-home dads are married fathers with children who care for their family domestic burden has led some couples to completely reverse their roles. The number of stay-at-home dads is starting to increase in Britain, Canada, 「husband who can do the housework, such as shopping, cooking, and looking alter the children. The widespread expectation that men should share the vin England showed that 75 percent of women in their twenties prefer a 38 on were breadwinners and women were caregivers. Arecent Traditionally, Survey can Many stay-at-home dads take great pleasure in showing affection to their children. Their wives can pursue careers without worrying about teaching family values or paying for child care. Research suggests that children of stay- athome dads often benefit from strong bonds with both parents, whereas the father's role ina stay-at-home mom household is less influential. Although the number of stay-at-home dads is increasing, it remains small Compared to the total number of fathers. In the United States, the government estimates that in 2009 there were 158,000 stay-at-home dads, a mere 0.2 percent of 67.8 million fathers. In Australia, about 1 percent of fathers are stay-at-home dads. In urban India, one estimate suggests 3 percent of fathers stay at home full-time. Some stay-at-home dads suffer from social stigma. Many people, including stay-at-home moms, do not understand why a man would choose to give up his career to care for his family full-time. Being a stay-at-home dad can also be career suicide. Many employers view stay-at-home dads as lacking ambition and commitment. Losing professional skills may prevent stay-at-home dads from returning to the workforce.

QuestionAとBの1について、私の回答で丸はもらえますか？教えていただきたいです 北大2017年の英作文の問題です。

Read the following passage. for my age. I leave home early and it takes about two hours on a crowded train to get to the office. I get Sunday off, but on the other days I'm usually in my office till nine o'clock, or even midnight on occasion. But I enjoy seeing the customers excited about our new products and services. Every August I take a 15 years. It's a secure job in a major company and I enjoy a relatively high salary six-day summer vacation, usually at my parents' place in Toyama. It's nice to Thave been working for a Japanese cell phone company in Tokyo for the last 2017年度(3] 32 a or the space of the countryside after my cramped apartment in the suburbs. However, I spend two days travelling there and back, and then it's straight back to work the next day. Last summer, however, I was able to take 10 days off in August and used the rare chance to take my wife on a foreign holiday by going to visit my old friend, Pierre, in Paris. He and I met at university in the US nearly 20 years ago when we were both international exchange students. We shared a love of tennis and S0on became good friends, and have stayed in touch. He now works as a supervisor in a post office in eastern Paris. It was lovely to see Pierre again and spend time in the spacious apartment he shares with his wife. I was very surprised to find that they were just back from a month-long summer vacation in southern France and Switzerland. Pierre told us that this is perfectly normal in his job, and couldn't believe his ears when I mentioned that my usual vacation is around a week and that I work 12 hours a day, six days a week. His usual workday, he said, was from 9:00 to 16:00. He wasn't joking ; he was back home by bicycle by 16:20 every day. He likes his job as the postal service fulfills a vital function in society by connecting people both aomestically andinternationally. On hearing his story, though, I began to reflect upon my own life and work. AmI working to live, or just living to work ? Answer questions A to C in English. You may use words and ideas from the Lext, but you must not copy complete sentences.

【大至急】 この問題が分かりません。 回答お願いします。

みみ の選守Yスる 1 2がNT ] 180g X 4.2J/(g・K) x(25 一0)K = 1.89 x 10*] = 18.9kJ 中7す(7より, 60kJ 十 18.9kj = 78.9kj 79kJ 還 了六 0Cの水36g を 120ての水蒸気にするのに に吸収される熱量は何 kl か。 ただし, 水(液体 人 蒸 穫Jg を1K 上昇ざせる に必要な熱量は 2.11, _氷9 第2章 物質の状態変化| 37

下線部がなぜ必要なのか解説お願いします！🙇‍♂️

36 第2章 李素数と方程式 次の方程式をみたす実数 2 を求めよ. (⑧+29ァ(2②ー2の9デ17一2 係数に 7 を含んだ方程式は, 必ず g二6? の形! のあるところとのないところにまとめなお の ポイント にある性質を利用します・ 提議委コ (3十2)ァ十(2一2の)9デデ17一2 で三 (3z二2の†(2ァ一292三17一2 ァ, ヶに実数より, 3z圭2ヶ, 2一2y は実数だから, 0 REOO①

センター英語で単語は大事だと思いますか？シス単の第2章まで全部覚えたらどのくらい取れますかね？