Grade

Subject

Type of questions

English Senior High

下から15行目のthrow whichのthrow とはなんですか?

y II Day 12 15 5 Negro Leagues Baseball was a collection of major and minor-league baseball leagues that were the first to showcase black team sports on intertwined with the African American and American experience not only a national scale. Launched in 1895, the leagues, as with jazz, became as a cultural element, but as a lucrative business endeavor. team The leagues were not under central management, and schedules and composition League, were changeable from season to season. Appearance and disappearance of leagues was common: the National Colored Baseball for instance, collapsed after only two weeks of operations. Latins, especially Cubans, were also a significant presence on teams. In these ways, the Negro Leagues were quite similar to their white counterparts which would eventually consolidate into Major League Baseball. Blacks near the beginning of the 20th century had only a fraction of whites' purchasing power, so the emergence of the Negro Leagues might have seemed unlikely. However, the Negro Leagues had two main draws that accounted for its business success. The first was a deep reserve of athletic talent. After blacks were formally excluded from white leagues in the 1880s, the Negro Leagues were the sole organization through which black players could work professionally. The quality of Negro Leagues 20 players was high, and substantiated through exhibition matches between Negro Leagues and Major League teams: over the years, both had their fair share of wins and losses in these matches. Another reason for the success of the Negro Leagues was an increasingly affluent black fan base. Driven by American industrialization, blacks were concentrating in major cities such as New York City, Chicago, and Atlanta. Usually barred by custom-and in the South by law-from attending many white entertainment outlets, blacks turned to Negro Leagues games. As a result of these factors, by the 20th century the Negro Leagues were earning a combined millions of dollars. This profitability ended with the desegregation of Major League Baseball. Black fans began attending Major League games, starving the Negro Leagues of its core revenue source. By 1951, the Negro Leagues had ended, although a succession of black star athletes in the Major League had begun.

Waiting Answers: 1
Mathematics Senior High

なぜこの問題でrを計算する必要がないんですか? rの値が変わったら答えも変わるはずなのに、rを無視して計算して座標を変数なしで決定しているのに納得いきません…

246 基本 例題 153 点の回転 π 00000 点P(3, 1) を, 点A (1, 4) を中心としてだけ回転させた点をQとする。 (1) 点A が原点0に移るような平行移動により、点Pが点P'に移るとする。 点Pを原点Oを中心としてだけ回転させた点の座標を求めよ。 (2)点Qの座標を求めよ。 P.241 基本事項 2 基本 指針点P (x0,yo)を,原点Oを中心として0だけ回転させた点を Q(x, y) とする。 y OP= r とし,動径 OP とx軸の正の向きとのなす角をαと x=rcosα,yo=rsina Q(rcos(a+0), sin(a+0) 3 0 P (rcosa, a rsina) x 解答 すると OQ=r で, 動径 OQとx軸の正の向きとのなす角を考える と 加法定理により x=rcos(a+b)=rcosacose-rsinasino =xocoso-yosin であるから 0 y=rsin(a+0)=rsina cos 0+rcos asinė OE =yocos0+xosin A この問題では,回転の中心が原点ではないから,上のことを直接使うわけにはいかな 3点P, A, Q を,回転の中心である点 A が原点に移るように平行移動して考える。 (1)点Aが原点0に移るような平行移動により、点Pは点 | P'(2, -3) に移る。 次に, 点 Q' の座標を(x', y') とする。 また, OP'=rとし, 動径 OP' とx軸の正の向きとのな 角をα とすると 2=rcosa, -3=rsina 12 x軸方向に -1, y 軸 方向に-4だけ平行移 動する。 補羽 S よってx=rcos(a+ x=rcos(u+/4/5)=r T =rcosa cos π 3 -rsinasin- 3 rを計算する必要はな 3 =2. ——— (−3). √3 π y=rsin(u+/4/5)=2 2+3√3 π =rsinacos+rcosasin T 3 3 YA 4 √3 2√3-3 =-3・ +2・ 2 2 1 したがって,点Q'の座標は (2+3/3 2/3-3) 2√3-3 (2) Q',原点が点Aに移るような平行移動によって, 点Qに移るから,点Qの座標は 2√3+5 (2+33 +1, 2√3-3+1)から(4+3/3 2/3+5) P 012 3 -3- P

Solved Answers: 2