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:2024/06/25 02:15:20
![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](/uploads/image/z/32475-3-5.jpg?t=%E7%AE%80%E4%BE%BF%E8%BF%90%E7%AE%97%EF%BC%9A1%2C9.42%2A10-94.2%2A0.9+2%2C3.61%2F%EF%BC%887.2-5.3%EF%BC%89%2A25+3%2C1.58%2F+%5B20-%EF%BC%885.4%2B6.7%EF%BC%89%5D+4%2C2.4%2A1.5%2B.6%2F1.5)
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