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杜楠:1/43+303/8686+90909/434343+13131313/86868686=多少?急求

admin
2020/08/11 16:46:54

陆培的回答:

1/43+303/8686+90909/434343+13131313/86868686 =1/43+(101×3)/(43×101)+(10101×9)/(43×10101)+(13×1010101)/(86×1010101) =1/43+3/43+9/43+13/86 =2/86+6/86+18/86+13/86 =39/86