简便计算：2.005×390+20.05×41+200.5×2
来源：学生作业帮助网 编辑：作业帮 时间：2024/11/08 06:04:46
简便计算：2.005×390+20.05×41+200.5×2
简便计算：2.005×390+20.05×41+200.5×2
简便计算：2.005×390+20.05×41+200.5×2
2.005*390+20.05*41+200.5*2
=2005*0.001*390+2005*0.01*41+2005*0.1*2
=2005* (0.39+0.41+0.2)
=2005
2.005×390+20.05×41+200.5×2=2.005×（390+410+200）=2005
20.05x39+20.05x41+20.05x20=20.05x(39+41+20)=20.05x100=2005
=20.05*(39+41+20)=20.05*100=2005