(1994/95×1.65-1994/95+7/20×1994/95) ×47.5×0.8×2.5
问题描述：
(1994/95×1.65-1994/95+7/20×1994/95) ×47.5×0.8×2.5
94 94 7 94
(20 95×1.65－20 95＋20×20 95)×47.5×0.8×2.5
答
(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...