2008×2010×（1/2008×2009+1/2009×2010)
=2008×2010×(1/2008-1/2009+1/2009-1/2010)
=2008×2010×(1/2008-1/2010)
=2010-2008
=2
2008乘2010乘(2008乘2009分之一加2009乘2010分之一)的简算
2008×2010×（1/2008×2009+1/2009×2010)
=2008×2010×(1/2008-1/2009+1/2009-1/2010)
=2008×2010×(1/2008-1/2010)
=2010-2008
=2