23.某商場將進(jìn)價(jià)為2000元的冰箱以2400元售出.平均每天能售出8臺.為了配合國家“家電下鄉(xiāng) 政策的實(shí)施.商場決定采取適當(dāng)?shù)慕祪r(jià)措施.調(diào)查表明:這種冰箱的售價(jià)每降低50元.平均每天就能多售出4臺. (1)假設(shè)每臺冰箱降價(jià)x元.商場每天銷售這種冰箱的利潤是y元.請寫出y與x之間的函數(shù)表達(dá)式,(不要求寫自變量的取值范圍) (2)商場要想在這種冰箱銷售中每天盈利4800元.同時(shí)又要使百姓得到實(shí)惠.每臺冰箱應(yīng)降價(jià)多少元? (3)每臺冰箱降價(jià)多少元時(shí).商場每天銷售這種冰箱的利潤最高?最高利潤是多少? 解:(1)根據(jù)題意.得. 即.······················································································ 2分 (2)由題意.得. 整理.得.················································································ 4分 解這個(gè)方程.得.·········································································· 5分 要使百姓得到實(shí)惠.取.所以.每臺冰箱應(yīng)降價(jià)200元.································· 6分 (3)對于. 當(dāng)時(shí).······················································································ 8分 . 所以.每臺冰箱的售價(jià)降價(jià)150元時(shí).商場的利潤最大.最大利潤是5000元. 10分 查看更多

 

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(2009年煙臺市)如圖,直線經(jīng)過點(diǎn)和點(diǎn),

直線過點(diǎn)A,則不等式的解集為(    )

A.         B.     

C.       D.

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(2009年煙臺市)如圖,數(shù)軸上兩點(diǎn)表示的數(shù)分別為,點(diǎn)B關(guān)于點(diǎn)A的對稱點(diǎn)為C,則點(diǎn)C所表示的數(shù)為(    )

A.           B.       C.           D.

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