如题所述
1/6+1/7+1/8=73/168
(730+1/6+1/7+1/8)÷(1/6+1/7+1/8)
=(730+73/168)÷73/168
=730x168/73+73/168x168/73
=1680+1
=1681
(730+1/6+1/7+1/8)÷(1/6+1/7+1/8)
=(730+73/168)÷73/168
=730x168/73+73/168x168/73
=1680+1
=1681
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