任取集合中的三個(gè)不同數(shù),且滿足,

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

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己知函數(shù)f(x)=在[-1,1]上的最大值為M(a) ,則函數(shù)g(x)=M(x)-的零點(diǎn)個(gè)數(shù)為

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已知全集,集合,則

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為了參加2013年市級高中籃球比賽,該市的某區(qū)決定從四所高中學(xué)校選出人組成男子籃球隊(duì)代表所在區(qū)參賽,隊(duì)員來源人數(shù)如下表:

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該區(qū)籃球隊(duì)經(jīng)過奮力拼搏獲得冠軍,現(xiàn)要從中選出兩名隊(duì)員代表冠軍隊(duì)發(fā)言.

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函數(shù)的定義域是

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