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数学 高校生

なぜこの連立方程式が立つのか分かりません。。(赤で囲ってある所です) 明日テストなので説明お願いします🙇‍♀️

llツM LevelUp敵時 軌国 。 往における最大・最小⑤⑫ | 23| 上G。 ) が和立不等式 3還組0 3z二4 12, 2zキッミ8, メー2 。 間 表す人域のや動 とき。 2寺光 の最大値と最小値を求めよ。 また, を のときの (*, ヵ) を求めよ。 訪上 エアニーを とおくと, これは原点を中心とする半径を の円を表す。 3z二4ッーニ12 …①⑪, 2xzオッーニ8 …②, ァー2ッニー6 …⑨ とする。 ①と@②, ④②と③, ③ と① をそれぞれ連立して解く 4 と, 領域は 3 点 A(4, 0), B(2, ④, C(0, 3) を頂点 とする三角形の内部および周である。 タダ上アーん(%>0) …の④。とおくと。 ④ は原点を中心とする半径 / の円を表す。 次に, ④がかのと共有点をもつようなんの最大値と最 小値を求める。 半径 /を が最大となるのは, 円 ④ が点 B(2②。 4 を通るときで ん= 22ユ42三 20 半径 / が最小となるのは, 円 のが直線 3z+49ー12ー0 と点Pで接するときで |0す0一12| 12 0 Me 732十42 5 まつが を= 鞭 "柏 尽は線分AC上にあるから, 確かに領域 上にある。 36 品 よって, ゲト は ⑫ 4 のとき景大値20 (革 5 のとき最人 H 38 点々。 の が連立不等式

未解決 回答数: 2
英語 高校生

この問題の答えを教えて欲しいです。 お願いします🙏

NM 6 ーー | otaのいとP 21 Ourtown is about two hundred meters( ) sea level. 』 Q①above @②beyond ⑧on ⑨wp 22 This is the coldest winter( )fOuryears. ①during ⑧②in ⑧of ④since 23 rfellasleep( )reading. (夫谷大) | ①as @fer ⑧during ④while 24 Wethoughtit odd( ) Don should be chosen the new manager. ①than ⑧that ③what ④whether (南山大) 25 The tram arrived ( ) time. ①at 。 ⑨@unail ⑧on ④by ( ON ) you have made a promise, you should keep i ①Before @②Though ⑨Once ④Unmless (往岡経六大) 27 You had better hurry up,( ) you will not be there ij time. Gand @or ⑧m ④@whe (立命仙大) 29 1 ) "No Smoking" signs,many people smoke in eleVators. ①Although 。 ②Despite ⑧③However ④msteadof 29 The festival will be held in the garden ( ) it rains. (東京電機大) Q①if ②@umless since ④lest 四 30 Please complete the assignment ( ) next Monday. ⑦①until @②by 。 @⑧since to 36 ) people in Japan take their shoes o作 indoors。people in China dont. (①Because of ②However ③Despie ④While (南山大) 32 "You seem to have had that car for years." "Yes, 1 should sell it ( ) it stll runs." Q①before ②during ⑨mtl ④while 33 This food testes teriblel 1 wouldteat it( ①after ②because (even ④only when 34 Mr Roberts has lived here ( ) five years. 8 ①since ⑨during im ④for 35 Shogihas been played ( ) ancient times. _Q①for ⑨o smce ④until ) itis impossible to Wave ons ar withoutb (センター試験) )Iwere starving. 6 (センター喜験) は 96 Theroomsare so small(

回答募集中 回答数: 0
化学 高校生

RHEED法の原理と得られる7つの情報が、この英文に書かれているみたいなのですが、よく分かりません。 分かる方助けてください!🙇‍♂️

INTRODUCTION Reection high-energy electron diHiraction (RHEED) uses a Rnely collimated electron beam with energy of 10-100 keV. The beam irradiates a sample surface with gazing incidence to obtain forward scattered difraction patterms. RHEED enables us to analyze structures of crystal surfaces at atomic levels and also to in situ monitor growth processes of thin films (mo、1988: Ichimiya and Cohen、2004: Peng et al.. 2011). From the arrangement。intensity and profile of the dilraction spots in RHEED patterns as described below in detail、 one can obtain various kinds of information: (1) the periodicity (unit cells) in atomic arrangements. (2) flat- ness of surfaces. (3) sizes of grains/domains of surface structures and microcrystals grown on the surface. (3) epitaxial relation between the grown flms/islands with respect to the substrate. (5) parameters character- izing structural phase transitions. (6) individual atomic positions in the unit cells. and (7) growth styles of thin films and numbers of atomic layers grown. The most important advantages of the method are that it is quite easy to install the RHEED apparatus in Yarious types of vacuum chambers without interfering with other components of apparatuses and to do real- time monitoring during thin-Rlm growths. Because of these advantages.RHEED is nowwidelyusednotonlyin research Iabs of surfaces and thin fims. but also in device production processes in industry Low-energy electron diiraction (LEED、see article Low-ENNERcy ErecroN DirscmoN)。 in which an electron beam of 10-100 eV in energy is irradiated onto a sample surface with nearly normal incidence to obtain back- scattered difraction patterns. is also widely used to analyze the atomic structures of crystal surfaces. Since one has to make the sample face directly to the LEED

未解決 回答数: 1