(1994/95×1.65-1994/95+7/20×1994/95) ×47.5×0.8×2.5

(1994/95×1.65-1994/95+7/20×1994/95) ×47.5×0.8×2.5?
提取1994/95得
1994/95(1.65-1+7/20)×47.5×0.8×2.5
化
=1994/95（0.65+7/20）*47.5*2 【0.65=13/20 ,0.8*2.5=2】
=1994/95*1*95
=1994
(20 95×1.65－20 95＋20×20 95)×47.5×0.8×2.5
同理
2095(1.65-1+20)*47.5*2
=2095*20.65*95【要手算】
=4109866.25