13又1/3*1又1/5*【3又5/6+(12.4-12又8/45】=

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13又1/3*1又1/5*【3又5/6+(12.4-12又8/45】=13又1/3*1又1/5*【3又5/6+(12.4-12又8/45】=13又1/3*1又1/5*【3又5/6+(12.4-12又8

13又1/3*1又1/5*【3又5/6+(12.4-12又8/45】=
13又1/3*1又1/5*【3又5/6+(12.4-12又8/45】=

13又1/3*1又1/5*【3又5/6+(12.4-12又8/45】=
13又1/3×1又1/5×【3又5/6＋（12.4-12又8/45）】
=40/3×6/5×【3又5/6+2/9】
=16×73/18
=584/9