2010乘以2009分之2010

2010乘以2009分之2010

2010x2010/2009
=(2009+1)x2010/2009
=2009x2010/2009+2010/2009
=2010+2010/2009
=2011又1/2009

2011乘以2011又2011分之2010

2011×2011又2010/2011
=2011×2011+2011×2010/2011
=4046131