2223分之1-1197分之1+819分之1=

3个回答

1/819+1/2223-1/1197
=1/(9*13*7)+1/(19*13*9)-1/(19*9*7)
=[19+7]/(19*13*9*7)-1/(19*9*7)
=2/(19*9*7)-1/(19*9*7)
=1/1197