2010乘2008/2009的简便运算

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2010乘2008/2009的简便运算
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2010乘2008/2009的简便运算
2010乘2008/2009的简便运算

2010乘2008/2009的简便运算
2010乘2008/2009
=(2009+1)×2008/2009
=2009×2008/2009+2008/2009
=2008+2008/2009
=2008又2008/2009

2010*2008/2009
=(2009+1)*(2009-1)/2009
=(2009²-1)/2009
=2009 - 1/2009
=2008又2008/2009

2010×2008/2009
=2010×(2009-1)÷2009
=2010×(1-1/2009)
=2010-2010/2009
=2010-(2009+1)/2009
=2010-1-1/2009
=2009-1/2009
=2008又2009分之2008