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数学 中学生

解き方の1の1のお父さんが15分で走った距離が5−3=2という式になるのがどういうことかわかりません。 教えて下さい!

例題と解き方 例題 1周が3kmの周回コースがある。 このコースを, 花子さんはサイ クリング, お父さんはランニングをした。 y (km) 18 2周して走り終えた。 このとき, 次の問いに答えなさい。 花子さんは,一定の速さで走り, 54分でこのコースを6周した。 2人 それぞれについて, 出発してからx分間で走った距離をykmとする。 右の図は,花子さんについてのxとyの関係を表したグラフである。 お父さんは,花子さんと同時に、 同じ地点を同じ方向へ出発した。 お父さん は出発してから,一定の速さで走り, 15分後に花子さんに初めて追い抜か れた。このときから,お父さんは毎分1/12kmの速さで走り続け, 1 0 54 (分) (B) 間でこのコースを 1 [1] お父さんが出発してから花子さんに初めて追い抜かれるまでの, お父さんについてのxとyの関係 を式で表しなさい。 A [2]お父さんが出発してから花子さんに2度目に追い抜かれたのは,2人が出発してから1分後であっ た。このとき, tの値を求めなさい。 <栃木県> 解き方 1x (時間) と (距離) の関係を式で表す [1]花子さんは54分で3×6=18(km) 走ったので, 花子さんの速さは 1/32km/分 1 よって,花子さんについてのxとyの関係は,y=3x お父さんは15分後に花子さんに初めて追い抜かれたので, 15分で5-3=2(km) 走ったことになる。このときの父の速さは1km/ y = 22/5x =x(0≦x≦15) 15 [2] この後、お父さんは速さ 12km/分で走るので、このときのお父さんについてのと 1 の関係は,y=1/2x+b と表すことができる。 x=39のときy=3×2=6なので.y=1/2x-12(1) 解き方2 「追い抜く」 「出会う」を式で表す お父さんが出発してから花子さんに2度目に追い抜かれるとき, お父さんの走った距離は花 子さんの走った距離より3×2=6(km) 少ないので1/31-12=1/31-6

解決済み 回答数: 1
英語 高校生

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.

未解決 回答数: 1