12+1又4/3-8又12/5-6.

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12+1又4/3-8又12/5-6.
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12+1又4/3-8又12/5-6.
12+1又4/3-8又12/5-6.

12+1又4/3-8又12/5-6.
12+1又4/3-8又12/5-6.75
=12+7/3-10.4-6.75
=12-10.4-6.75+7/3
=-5.15+7/3
=-103/20+7/3
=-169/60
=-2又49/60

12+1又4/3-8又12/5-6.75
=14+1/3-10-2/5-6.75
=1/3-3.15
=-2又49/60

12+1又4/3-8又12/5-6.75
=12+1.75-8又12/5-6.75
=7-8又12/5
=-1又12/5