2007分之2006乘2008 2010乘2009分之2008

问题描述:

2007分之2006乘2008 2010乘2009分之2008

2007分之2006乘2008
=(1-1/2007)×2008
=2008-2008/2007
=2006又2006/2007
2010乘2009分之2008
=2010×(1-1/2009)
=2010-2010/2009
=2008又2008/2009

2006/2007×2008
=2006/2007×(2007+1)
=2006/2007×2007+2006/2007
=2006又2006/2007
2010×2008/2009
=(2009+1)×2008/2009
=2009×2008/2009+2008/2009
=2008又2008/2009