春节期间,物价局规定花生油的最低价格为4.1元/kg,最高价格为4.5元/kg,小王按4.1元/kg购入,若原价出售,则每天平均可卖出200kg,若价格每上涨0.1元,则每天少卖出20kg,若油价定为X元,每天获利W元,求W与X满足怎样的关系式?
解:定价为x元/kg,每千克获利(x﹣4.1)元,
则每天的销售量为:200﹣20(x﹣4.1)×10=﹣200+1020,
每天获利W=(﹣200x+1020)(x﹣4.1)=﹣200x2+1840x﹣4182.
①There is a ping-pong game on April ____ (twenty-nine).
②____ Tom ____ (like) the tennis game?
③Jim ____ (have) an art class every day.
④Do you know his brother is only 5 ____ (year) old?
⑤ My mother wants ____ (have) a party for me.
⑥Those boys and girls are all ____ (China).
⑦ -How many ____ (sweater) do you have? -Three.
⑧Today is my ____ (twenty) birthday.
⑨They want to have two baseball ____ (game).
⑩When ____ (be) the School Day?
把下列词语补充完整
山穷____ ____ ____ ____叠翠 ____ ____云散
风光____ ____ 名山____ ____ 热情____ ____
太阳____ ____ ____ ____细雨 点点____ ____
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