Question: eliminating noise


I have 10 equations and the summation of them will give me the answer but each of them have small numeric noises and the sumation of them makes the final result inaccurate.  For example the first equation is 

where h1 and bb are small parameters and like this equation, other 9 equations contains some noises and I want to omit the them so only effective terms will be appreared in the summation. What is the appropiate command in maple?


Thanks for your attention in advance

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