3又3/5×【8又4/5÷( 4-2.4×14/15】 计算

3又3/5×【8又4/5÷( 4-2.4×14/15】 计算
= 18/5 x [ 44/5 ÷ ( 4- 12/5 x 14/15) ]
= 18/5 x [ 44/5 ÷ ( 4- 168/75) ]
= 18/5 x [ 44/5 ÷ 132/75 ]
= 18/5 x [ 44/5 x 75 / 132 ]
= 18/5 x 15 / 3
= 18/5 x 5
= 18