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数学 高校生

(3)がわかりません、先生の解答と私の回答を添付しました a+3/2 < a+1 と a+3/2 ≧ a+1をなぜここで使ってくるのかがわかりません 解説よろしくお願いします🙇

習 【数と式 ⑤】 ★★★ 2次方程式2-(3a +5)x+a^+4a+3=0 ① (aは定数)がある。 (1) x=-1が方程式①の解であるとき,aの値を求めよ。 (2) 方程式①の解をαを用いて表せ。 1年間の総復習 【2次関数 ④ 放物線y=x4ax+2b...... ①がx a,bは定数とする。 (1) 放物線①の頂点の座標を求めよ。 (3) 方程式①の解がすべて, 不等式3a-5<2x < 3g+5 を満たすxの範囲内にある (2) 放物線 ①が点 ときの値の範囲を求めよ。 (1) ニートが解より代入 2(リー(3a+5)(-1)+a2+4a+3=0 2+3a+5+aziqa+3=0 Q:70+10-0 ・a=-2,-5 (11/16)を通るとこ 4'16 さらに, AB=2√5であるとき、 難 (3) 2点A、Bのx座標がともに0x めよ。 このとき, A. Bのx座標を うな整数の値を求めよ。 y=(x-243-4a2+21 (a+2) (a+5)=0 (2) 頂点(20-4026 ①がx軸と異なる2点 で交わっているので (2) 2-(a+3)→-a-3 2x²-(3a+5)x+(a+1) (a+3)=0 {x-(a+3)}{x-1)}=0 B) X = Q+3 atl 2 / 30-52x<3a+s (1) a+3 2 30-5 くく < atlaとはすなわち かつ a+3 atl<30+5 -② 1X-(a+1)→2a-2 -39-5 at3 ②とatは 大平関係はまだわから ない。0,10,-10 a+3c2a+2 ①が(本店)の代入 このと = -40 * +2b 2b=aよって b=/2/20 b<2087 Jacza 4a²-a> o 0140-1)>0 · a<o. <a⋅ (3)チス=400+2 fon= (x-a4a alaとき ここで、 軸x=2a SCRE ①、②aっしょり ①より 30-5913 at 3a75 J 134-50+3 2ac8 a<4-0' ②より 20+2c3a+s a2-3-②' -3 kack (l) a+3 12 ≧ atlaときすなわちa+3≧20+2 30<a+1 -③ 2 かつ a≦1のとき 2 ②より 3a-52a+2 a7-③ 8 0 fu fis ③-40+2b< b<za² ④ 02a8 019<4 26:0 b>o- ⑥564-32a+26 →a b16a- 39-5 +1 +336+5 ④からQ ③1 ④ry a+3<3a+5 7 07-115 -1<0≤1 a=1, 9組のう 満たすの Q=3

解決済み 回答数: 1
英語 高校生

教えて欲しいです🙏

解 次の英文を読んで、あとの問いに答えなさい。 There was a famous highway in the United States called Route 66. It stretched from the city of Chicago in the middle of the country to Los Angeles in the West. It was nearly 4,000 kilometers long. For decades, it was the country's most important highway. Construction of Route 66 started in the 1920s. At that time, U.S. car ownership was growing 5 fast. In 1910, there were 500,000 cars. By 1920, there were nearly 10 million! Route 66 was built over many smaller roads between Chicago and Los Angeles. As more Americans began driving, they explored their country. Therefore, Route 66 shaped the U.S. economy and popular culture. Many businesses started in towns along Route 66. These gas stations, fast food restaurants, and hotels. There were songs and television shows 10 about Route 66. It appeared in books by famous U.S. authors like John Steinbeck. included However, Route 66 was more primitive than today's highways. Heavy traffic from cars and large trucks damaged the two-lane highway. This made Route 66 unsafe. By the 1950s, the U.S. began replacing it with modern, four-lane highways. In 1984, the last section was replaced. Today, people can ( A ) drive on parts of former Route 66. They can also visit museums or 15 look at old photographs of Route 66. But most of the kicks on that famous highway are ( B ). (ORIGINAL MATERIAL) 問1 本文の内容に合うように,次の質問 1.2に対する答えの空所を英語で埋め, 文を完成し なさい。 1. How did Route 66 shape the U.S. economy? ルート66は米国経済をどのように形作ったのか Many businesses, such as started along the way. 2. How did Route 66 shape U.S. popular culture? about Route 66 helped to shape it.

解決済み 回答数: 1