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试题选解

2014-12-09 10:00:00| 分类：试题集锦 | 标签： |举报 |字号大中小订阅

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《课易通 三维数字课堂》数学九年级全一册P74精彩一题：

如图，点A，B在直线MN上，AB=11cm，⊙A，⊙B的半径均为1cm．⊙A以每秒2cm的速度自左向右运动，与此同时，⊙B的半径也不断增大，其半径r（cm）与时间t（s）之间的关系式为r=1+t（t≥0）．
（1）试写出点A，B之间的距离d（cm）与时间t（s）之间的函数表达式；
（2）问点A出发后多少秒两圆相切？

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