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英語 高校生

FLEX2 レッスン3 教科書のcompressionが分からなさすぎてヘルプです

Choose the appropriate answer. hartan art ell 1. It became more important for people to get salt a. when Roman soldiers were given money to buy it b. when people started to hunt animals for food c. when people ate less meat and began to eat more grains and wheat 3. The influences of salt can be seen a. in modern cultures b. not in languages but in customs and religions c. more in languages than in customs or religions boyasdo 2. What ancient people discovered was a. that salt could stop droughts and help people survive a lack of food b. that salt helps bacteria grow foods c. that salt keeps foods from going bad 4 4. Thanks to some discoveries by scientists, a. people have changed how they produce salt b. people have begun to use salt in new ways edme c. people have found that salt has always had an influence on many cultures Salt is 1 dor d blues 2 Fill in each blank with the most appropriate word to complete the summary. EXTER Jika ODOY velg avs ) for our lives and we cannot live without it. In ancient times, as people be eat more food which were low in salt, they needed a lot more salt to survive. Eventually it bec 2 3 ) trade item. Also, salt was used to ) famines and travel to ) food. Because of this, people 5 ancient people, has also 6 ) places. Salt, which was very importa modern cultures. Some used, and its influence can also be found in some ) related to salt an 8 ). One important scie 9 ) enabled people to produce new things. Salt is now a common item, but it has had ) on the world. 10 7 affected / available / decrease / discovery distant expressions impact / precious / preserve / religions essential survive

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数学 高校生

なんでこうなるんですか?

(a<B) て表せ。 (2) lとCで囲まれた部分の面積の最小値とそのときのmの値を求めよ。 OLUTION OLUTION CHART 放物線と面積Sex-ar)(x-B)dx= 曲 面積は (mの2次式) となるから, まず (mの2次式) の最小値を求める。 直線lの方程式は x=m(x-2)+6 すなわち x2-mx+2(m-3)=0 の判別式をとスレ (x-a)(x-β)dx=-12(B-α)を活用 y=m(x-2)+6 D=(-m)²-4.2(m-3)=(m-42-8- とって l と C は異なる2つの共有点をもつ。 aβ (a <β) は, 2次方程式 ① の解であるから β-a=- 2 m+√D m-√D 2 (2) とじで囲まれた部分の面積を Sとすると、 右の図から で最小値 CB = -√(x²_ mx+2(m−3)} dx = f(x-a)(x-B)dx このとき s={m(x-2)+6-x2}dx程式 2)=(2 5450 =-(-1/2) (8-a)³² = 1/² (B-α) ³ (B-a)³ 6 (1) から sp -=√D=√√m²-8m+2 入して Ja PRACTICE ... 219③ をとる。 + ------- 6 α 0 S S=(√m²_8m+24)³ = ((m−4)²+8} ² ¹ ① 2β (-4)²+8はm=4で最小値 8 をとるから, Sは, m=4 8√2 3 ついて x座標をα, β x |基本 210 ←方程式 ① の実数解があ れば,それはℓとCの 共有点のx座標となる。 HARTA SI inf. β-αの計算 平 解と係数の関係を用いても よい。 α, β の値は解の公式か ら求める。 また D=m²-8m+24 α, βは①の2つの解であ るから α+β=m, aß=2(m-3) よって (B-α)²=(a+B)²-4aB =m²-4.2(m-3) =m²-8m+24 β-α>0 であるから β-α=√m²-8m+24 +1-87=1-8√/8= 8√/2 3 R39 ( fort

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