(20052005-2005.2005)/(80208020-8020.8020)
问题描述：
(20052005-2005.2005)/(80208020-8020.8020)
8.1*1.3-8/1+1.9*1.3+11.9/1.3
答
(20052005-2005.2005)÷(80208020-8020.8020) =2005*(10001-1.0001)÷[8020*(10001-1.0001) =2005÷8020 =1/48.1×1.3-8÷1.3+1.9×1.3+11.9÷1.3=(8.1+1.9)×1.3+(11.9-8)÷1.3=13-3=10