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English Junior High

この文のthey are many kinds of herbal tea and they have many usesは、解説にはハーブティーは多くの種類があり多くの使い方がある。 となっていたのですが、usesで使い方、となるのですか?

Today, people enjoy tea in many other ways. Tea is often used in food United Kingdom started enjoying tea in new ways like putting milk or sugar dishes. In Japan, some types of noodles such as soba and udon may have cookies or ice cream. Some people eat the tea leaf itself because they believe 短期間 面接 これ1 Awncui to Europe and the United States in the 16th or 17th century, and people in the Senghp this-mail to:gsk you/tg >本 onsしLa seg The World of Tea tea, Chinese tea, and English tea are popular now. People in China st Jca from the leaves/of the tea plant thousands of years ago, It was making introduced started >重 各Day とめ って Onted Kingdom started enijoying tea in new ways like putting milk or s. your program every Sunday! 1v Sugar in it. other woo ways. Tea is often used in food Today, people enjoy tea in many my pomer Sepigm green tea mixed in them. Different teas are also used in desserts, for example Cookies or ice cream. Some people eat the tea leaf itself because they believe it is good for their health. オodhomasihy h1eoigsga s yslT S Tea itself is changing, too. Some people say that tea must be made from ne tea plant to call it “tea,” but it has become to make tea from other things such as flowers, fruits, and vegetables. This is called herbal tea.* What is special about herbal tea? There are ララ popular many kinds of herbal teas、 A qoGe jsicでOM LOISL A oe and they have many uses. For example, Chinese herbal tea has been used as medicine. Like regular tea, there are many different flavors of herbal tea. Today, herbal teas are often seen in stores and many other places. Tea has become a part of everyday life. 01 brswnol gnidool * herbal ten :

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Mathematics Senior High

この問題の(5)について a-b+cは、x=−1におけるyの値である。 とありますが、なぜそうなるのか分かりません どなたか教えて頂けないでしょうか? よろしくお願いしますm(__)m

DOO0 基本例題50 2次関数の係数の符号とグラフ 2次関数 y=ax*+bx+c のグラフが右の図で与えら れているとき,次の値の符号を調べよ。 At (2) b (3) c (4) 6-4ac (5) a-b+c p.83 基本事項4,基本 49 CHART OLUTION → aの符号 bの符号 グラフから(1)上に凸 (2) 軸が負·上に凸 (3) y軸の負の部分と交わる → cの符号 がわかる。 また,(5) では x=-1 におけるyの値に注目。 解答 6-4ac 4a 2 *ax°+ bx+c ax°+ bx+c=a\x+ 2a +c よって,放物線 y=ax°+ bx+c の b 軸は 直線 x= 2a b \2 =a{x+ 2a +c (2a, -4-4。 =d* b \2 +c 2a b 6°-4ac ーa 頂点のy座標は 4a b \2 6°-4ac y軸との交点のy座標は c また,x=-1 のとき y=a(-1)?+ 6(-1)+c=a-b+c (1) グラフが上に凸であるから 4a a<0 -2a 6 <0 (2) 軸がx<0 の部分にあるから (1)より,a<0であるから 6<0 (3) グラフがy軸の負の部分と交わるから 6°-4ac >0 c<0 (4) 頂点のy座標が正であるから 放物線 y=ax*+ bx+c 4a について (1)より,a<0 であるから ー(6-4ac)<0 (5) a-b+cは,x=-1 におけるyの値である。 グラフから,x=-1 のとき a-b+c>0 *軸と異なる2点で交わ る →8-4ac>0 が成り立つ。 (p.128 以降を参照) すなわち B-4ac>0 y>0 すなわち

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