简算20.05*39+200.5*4.1+40*10.025提示:40*10.025=2*20*10.025=20*20.05

问题描述:

简算20.05*39+200.5*4.1+40*10.025
提示:40*10.025=2*20*10.025=20*20.05

20.05*39+200.5*4.1+40*10.025
=20.05*39+20.05*41+20*20.05
=20.05*(39+41+20)
=20.05*100
=2005

20.05*39+200.5*4.1+40*10.025
=20.05*39+20.05*41+2*10.025*20
=20.05*39+20.05*41+20.05*20
=(39+41+20)*20.05
=100*20.05
=2005

=20.05*39+20.05*41+20.05*20=20.05*(39+41+20)=20.05*100=2005