更新时间2018-06-18 13:34:46
原式=(4/5×3/5-3/20)÷1/15
=(12/25-3/20)×15
=12/25×15-3/20×15
=36/5-9/4
=9×(4/5-1/4)
=9×(16/20-5/20)
=9×11/20
=99/20
解原式=(4/3-20/3)/(15/1)
=(-16/3)/(15/1)
=(-16/3)*(1/15)
=-16/45
(4/5×5/3﹣20/3)÷15/1
=(4/3-20/3)÷15
=-16/3÷15
=-15/45
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