(1/4+1/6-1/2)×12

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(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
利用乘法分配率有:
  原式=1/4×12+1/6×12-1/2×12
  =3+2-6
  =-1

1/4×12+1/6×12-1/2*12=3+2-6=-1