(78.6-0.786×2.5+0.75×21.4)÷15×1997=?
问题描述:
(78.6-0.786×2.5+0.75×21.4)÷15×1997=?
答
(78.6-0.786×2.5+0.75×21.4)÷15×1997=(393/5-393/500*5/2+3/4*107/5)/15*1997=(393/5-393/200+321/20)/15*1997=(393/5+2817/200)/15*1997=18537/200/15*1997=12339.463