(1/4+1/6-1/2)×12

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(1/4+1/6-1/2)×12(1/4+1/6-1/2)×12(1/4+1/6-1/2)×12

(1/4+1/6-1/2)×12
(1/4+1/6-1/2)×12

(1/4+1/6-1/2)×12