函數(shù)的定義域是

    A． B．    C． D．                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         

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己知函數(shù)f (x)=e2，xR

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(2)證明：曲線y=f(x)與曲線y=有唯一公共點(diǎn)；

(3)設(shè)a﹤b，比較與的大小，并說明理由。

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 如圖，四棱錐的底面是正方形，⊥平面，

（1）求證：；

（2）求二面角的大小.

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任取集合中的三個不同數(shù)，且滿足，,

則選取這樣三個數(shù)的方法共有         種.（用數(shù)字作答）

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若函數(shù)有兩個不同的零點(diǎn)，則實數(shù)的取值范圍是

A．            B．      C．           D．

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函數(shù)的值域為                  ．

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己知一個正三棱錐的正視圖為等腰直角三角形，其尺寸如圖所示，則其側(cè)視圖的周長為________________．

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執(zhí)行如圖所示的程序框圖，若輸入

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