【導(dǎo)讀】已知全集U=R，集合????的準(zhǔn)線交于A，B. ，則圓C的面積為。已知()fx是定義在R上的奇函數(shù)，且當(dāng)x>0對(duì)，，則它們的大小關(guān)系為。如圖的幾何體是長(zhǎng)方體1111ABCDABCD?則該幾何體的外接球。在區(qū)間(0，4)上有三。展開式中的常數(shù)項(xiàng)為。影，他們到達(dá)電影院之后發(fā)現(xiàn)，na的各項(xiàng)取倒數(shù)后按原來順序構(gòu)成等差數(shù)。列，各項(xiàng)都是正數(shù)的數(shù)列??的圖象向右平移23?的圖象，若函數(shù)()ygxk??上有零點(diǎn)，求實(shí)數(shù)k. na的前n項(xiàng)和為nS，561124,143aaS???nb的前n項(xiàng)和為nT. na的通項(xiàng)公式及數(shù)列?？蛽頂D等級(jí)均為良的概率；取3天，記這3天游客擁擠等級(jí)為優(yōu)的天數(shù)為?DB，其中三棱錐P-BCD. ，直線l與E相交于M，N兩點(diǎn)，l與x軸、y軸分別相。(Ⅱ)判斷是否存在直線l，滿足2,2OCOMODODONOC????？為自然對(duì)數(shù)的底數(shù)

　　

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