3.9*9.8*0.93简便运算4.2*1.2-5.2*0.7
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/03 19:17:34
![3.9*9.8*0.93简便运算4.2*1.2-5.2*0.7](/uploads/image/z/751185-9-5.jpg?t=3.9%2A9.8%2A0.93%E7%AE%80%E4%BE%BF%E8%BF%90%E7%AE%974.2%2A1.2-5.2%2A0.7)
3.9*9.8*0.93简便运算4.2*1.2-5.2*0.7
3.9*9.8*0.93简便运算
4.2*1.2-5.2*0.7
3.9*9.8*0.93简便运算4.2*1.2-5.2*0.7
3.9*9.8*0.93
=(4-0.1)*(10-0.2)*(1-0.07)
=(40-1-0.8+0.02)*(1-0.07)
=(39-0.78)*(1-0.07)
=39-0.78-39*0.07+0.78*0.07
=39-0.78-2.73+0.0546
=39-3.51+0.0546
=39-3.51+0.01+0.0446
=35.5446
4.2*1.2-5.2*0.7
=4.8+0.24-3.5-0.14
=1.4