(9/14+4/19)×14+ 1÷19
=9/14X14+4/19X14+1/19
=9+56/19+1/19
=9+57/19
=9+3
=12
(9/14+4/19)×14+ 1÷19简便计算
(9/14+4/19)×14+ 1÷19
=9/14×14+4/19×14+1/19
=9+56/19+1/19
=9+(56/19+1/19)
=9+3
=12
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