下列函数①y=πx,②y=2x-1,③ y= 1 x ,④y=2 -1 -3x,⑤y=x 2 -1中,是一次函数的有( )
A.
4个
B.
3个
C.
2个
D.
1个
拍照语音搜题,微信中搜索"皮皮学"使用
参考答案:
参考解析:
知识点:
皮皮学刷刷变学霸
举一反三
【简答题】It was the beginning of a new term. As a(n) 36 teacher in that school, I didn’t know any of the students. A little girl was 37 at the gate of the class room. She looked very 38 . I walked up to her an...