2011*2009/2010,简便计算.

来源:学生作业帮助网 编辑:作业帮 时间:2024/11/07 18:19:46

2011*2009/2010,简便计算.
2011*2009/2010,简便计算.

2011*2009/2010,简便计算.
2011×(2009/2010)
=(2010+1)×2009/2010
=2009+2009/2010
=2009又2009/2010

2011*2009/2010
=2010×2009/2010+1×2009/2010
=2009+2009/2010
=2009又2009/2010


2011*2009/2010
=2011×2009/2010
=(2010+1)(2010-1)/2010
=(2010^2-1)/2010
=2010-1/2010
=2009+2009/2010
=2009又2009/2010
或者:
2011*2009/2010
=2011×2009/2010
=(2010+1)(2010-1)/2010
=(2010^2-1)/2010
=(4040100-1)/2010
=4040099/2010

2011×(2009/2010)
=(2010+1)×2009/2010
=2009+2009/2010
=2009又2009/2010