2025年教学资料:3.1函数的概念(分层作业)(解析版)
3.1函数的概念分层作业1.已知f(x)=2x+1,则f(5)=( C )A.3 B.7C.11D.25[解析] f(5)=2×5+1=11,故选C.2.下列四个图形中,不是以x为自变量的函数的图象是()A.B.C.D.【答案】C【分析】根据函数中每一个自变量有且只有唯一函数值与之对应,结合函数图象判断符合函数定义的图象即可.【详解】由函数定义:定义域内的每一个x都有唯一函数值与之对应,A、B、D选项中的图象都符合;C项中对于大于零的x而言,有两个不同的函数值与之对应,不符合函数定义.故选:C3.若,则A.B.C.D.【答案】C【详解】分析:依次根据自变量的范围代入函数,由内向外...
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