[考点]
小数的读写、意义及分类,小数的近似数及其求法,
[答案]
(1)相等,0.01,0.001;
(2)4,3.8,3.79。
[解析]
解:(1)5.05与5.050的大小相等,其中5.05的计数单位是0.01,5.050的计数单位是0.001。
(2)3.785保留整数约是4,保留一位小数约是3.8,保留两位小数约是3.79。
故答案为:相等,0.01,0.001;4,3.8,3.79。
[点评]
本题考查了"小数的读写、意义及分类,小数的近似数及其求法,",属于"易错题",熟悉题型是解题的关键。