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在一次单元测试中,我遇到了如下一道题目:某电信公司为顾客提供了 A,B两种手机上网方式,一个月的手机上网费用y(元)与上网时间x(min)之间的关系如图1所示.如果一个月上网300min,那么方式B产生的费用比方式A高__________元.
一道一次函数题的浅入深出
【摘 要】
：
在一次单元测试中,我遇到了如下一道题目:某电信公司为顾客提供了 A,B两种手机上网方式,一个月的手机上网费用y(元)与上网时间x(min)之间的关系如图1所示.如果一个月上网300m
【机 构】
：
浙江宁波市董玉娣中学805班
【出 处】
：
中学生数理化（八年级数学）
【发表日期】
：
2021年5期
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