2011*2009/2010,简便计算.

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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

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