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数学 高校生

まるで括ってあるところの解説お願いします。

とき 14に、 * ) 場合分けの 式の解の共 る。 -1 20 0 1 2 通範囲 合わせた ついてはp.59 xの値の範 重要 例題 100 文字係数の2次不等式の解 TOI 次のxについての不等式を解け。ただし, aは定数とする。 5x²(a²+a)x+a³ ≤0 基本 30, 85,86 =2x から x-2)=0 から SOLUTION 係数に文字を含む2次不等式 場合分けに注意 HART& 解答 不等式から したがって [1] a <α² のとき a(a−1)>0 a²-a>0 5 よって a<0, 1<a このとき, ①の解は a≤x≤a² 左辺は,たすき掛けにより因数分解できて (x-a)(x-a²)≦0 α<βのとき (x-a)(x-β)≦0amxp ここでは α,βがともにaの式で表されるから, a と との大小関係で場合が分 かれる。 ......。 x²(a²+a)x+a³ ≤0 (x-a)(x-a²) ≤0 (1) [2] a=a のとき a²a = 0 から よって α=0 のとき α=1のとき f(x)>g(x) =f(x)のグラ] [3] a>α² のとき のグラフより a²-a< 0 から よって このとき, ① の解は a² ≤x≤a 以上から a(a-1)=0 a=0, 1 ① は x≧0 となり x=0 ① は (x-1)'≤0 となり a(a-1)<0 0<a<1 0<a<1のとき a=0 のとき a=1のとき a < 0, 1 <a のとき a≦x≦a²) a²≤x≤a) PRACTICE・・・ 100 ③ x=0 x=1 x=1 重要 102 3/29 ◆ たすき掛け 1 1 -a → - a -a²-a² a³ con AJ ity Wear On - (a² + a) 0≦x≦0 は x = 0, 1≦x≦1 は x=1 を表すから, 解は 0≦a≦1のとき a² ≤x≤a a < 0, 1 <a のとき a≤x≤a² と書いてもよい。 153 αの値を①に代入。 (x-α)2 0 を満たす解 はx=α のみ。 3章 11 2次不等式

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英語 高校生

ここのマーカーで引いている部分の訳し方を教えて頂きたいです!

adulthood began, I would stick it on that Thanksgiving weekend in 1981. I was seventeen. While my roommate packed her bag to go home on Wednesday, I walked to a supermarket with a shopping list. I had borrowed a copy of The Joy of Cooking from the library when I realized ( 1 ). I found five other students who lived in other *dormitories who also had no way of getting home and invited them to dinner. It never occurred to me to ask someone if I could stay in my room. It was my room, after all. But on Wednesday night, when the heating in the dormitory was turned down to whatever temperature was needed to keep water from freezing in the pipes, I wondered if maybe I'd been expected to leave along with all the other girls. Too late now. The office was closed until Monday morning. In those days, before cell phones and the internet, such problems were solved not by changing my coat. the situation but by changing yourself. I put on another sweater and (3) I suppose before I went to college I had been very modestly helpful to m mother on Thanksgiving. When she asked me to peel a vegetable, I peeled it, an hen went away to watch the Macy's parade on television until she called me ba o peel something else made no effort until 1981, when the Thanksgiving din at people were coming to was mine. That was when I started cutting fro atter into pea-sized *chunks with a frozen knife in my frozen hands to mak ie crust. ② 2 -

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