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下列各式中,表示 y是 x的函数的有(     ) ① y= x-( x-3);       ② y= http://picflow.koolearn.com/upload/2010-03/09/e59b4a09-3fa2-4f7c-a194-a2cf434a6b92/paper.files/image001.gif+ http://picflow.koolearn.com/upload/2010-03/09/e59b4a09-3fa2-4f7c-a194-a2cf434a6b92/paper.files/image002.gif; ③ y= http://picflow.koolearn.com/upload/2010-03/09/e59b4a09-3fa2-4f7c-a194-a2cf434a6b92/paper.files/image003.gif  ④ y= http://picflow.koolearn.com/upload/2010-03/09/e59b4a09-3fa2-4f7c-a194-a2cf434a6b92/paper.files/image004.gif

发布时间:2021-08-04

A.4个

B.3个

C.2个

D.1个

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