列递等式 简便 计算:(1)9.81X9.8 (2)0.027+9.9X0.27 (3)13.4-0.4X3

来源:学生作业帮助网 编辑:作业帮 时间:2024/04/27 14:54:41

列递等式 简便 计算:(1)9.81X9.8 (2)0.027+9.9X0.27 (3)13.4-0.4X3
列递等式 简便 计算:(1)9.81X9.8 (2)0.027+9.9X0.27 (3)13.4-0.4X3

列递等式 简便 计算:(1)9.81X9.8 (2)0.027+9.9X0.27 (3)13.4-0.4X3
(1)9.81X9.8
=9.81×(10-0.2)
=98.1-1.962
=96.138
(2)0.027+9.9X0.27
=0.027+99×0.027
=0.027×(1+99)
=0.027×100
=2.7
(3)13.4-0.4X3
=13.4-1.2
=12.2

1. 9.81*9.8=9.81*10-9.81*0.2=98.1-1.962=96.138
2. 0.027+9.9X0.27=0.27*(0.1+9.9)=0.27*10=2.7
3. 13.4-0.4X3=13.4-1.2=12.2