86分之1+4343分之303+868686分之90909+43434343分之13131313

原式=1/86+606/8686+90909/868686+26262626/86868686 =1/86+(6×101)/(86×101)+(9×10101)/(86×10101)+(26×1010101)/(86×1010101) =1/86+6/86+9/86+26/86 =42/86 =21/43