997÷997997/998+1/999
问题描述:
997÷997997/998+1/999
答
原式=997×998/997997+1/999
=998/1001+1/999
=(998×999+1001)/(999×1001)
=(998×1000-998+1001)/[(1000+1)(1000-1)]
=(998000+3)/(1000000-1)
=998003/999999