简便运算 1.(2.5-2.5*0.6)/0.4 2.1.47/(2-1.02)+0.61*14 3.2000/12.5/25/0.8
问题描述：
简便运算 1.(2.5-2.5*0.6)/0.4 2.1.47/(2-1.02)+0.61*14 3.2000/12.5/25/0.8
答
(2.5-2.5*0.6)/0.4 =(2.5*1-2.5*0.6)/0.4 =2.5*(1-0.6)/0.4=2.5*0.4/0.4=2.51.47/(2-1.02)+0.61*14 = 1.47/0.98 +0.61*14=0.03*7*7/(0.02*7*7) +0.61*14=1.5+0.61*14=10.042000/12.5/25/0.8=2000/(12.5 * 0.8*25)=2...