12/(1/2-1/3-1/4)=

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12/(1/2-1/3-1/4)=

12/(1/2-1/3-1/4)=
12/(1/2-1/3-1/4)=

12/(1/2-1/3-1/4)=
解12/(1/2-1/3-1/4)
=12/(6/12-4/12-3/12)
=12/(2/12-3/12)
=12/(-1/12)
=12×(-12)
=-144

12/(1/2-1/3-1/4)题目有错【1/2根本不够-1/3和1/4。】!

-144