简便运算:1,9.42*10-94.2*0.9 2,3.61/(7.2-5.3)*25 3,1.58/ [20-(5.4+6.7)] 4,2.4*1.5+.6/1.5

来源:学生作业帮助网 编辑:作业帮 时间:2024/04/30 04:22:08
简便运算:1,9.42*10-94.2*0.9 2,3.61/(7.2-5.3)*25 3,1.58/ [20-(5.4+6.7)] 4,2.4*1.5+.6/1.5

简便运算:1,9.42*10-94.2*0.9 2,3.61/(7.2-5.3)*25 3,1.58/ [20-(5.4+6.7)] 4,2.4*1.5+.6/1.5
简便运算:1,9.42*10-94.2*0.9 2,3.61/(7.2-5.3)*25 3,1.58/ [20-(5.4+6.7)] 4,2.4*1.5+.6/1.5

简便运算:1,9.42*10-94.2*0.9 2,3.61/(7.2-5.3)*25 3,1.58/ [20-(5.4+6.7)] 4,2.4*1.5+.6/1.5
1,9.42*10-94.2*0.9 =9.42*(10-9)=9.42
2,3.61/(7.2-5.3)*253.61/1.9*25=1.9*25=(2-0.1)*25=50-2.5=47.5
3,1.58/ [20-(5.4+6.7)]=1.58/【20-(5.4+6.6+0.1)】=1.58/【8-0.1】=0.2
4,2.4*1.5+.6/1.5=1.5*(2.4+0.6)=1.5*3=4.5

1、9.42*10-94.2*0.9 =9.42*10-9.42*9=9.42*(10-9)=9.42
2、 3.61/(7.2-5.3)*25 =3.61/1.9*25=1.9*25=(2-0.1)*25=50-2.5=47.5
3、1.58/ [20-(5.4+6.7)] =1.58/ [20-(5.4+6.6+0.1)] =1.58/ (20-12-0.1)=1.58/ 7.9=0.2
4、 2.4*1.5+0.6/1.5=2.4*(1+0.5)+6/15=2.4+1.2+2/5=3.6+0.4=4