简便运算.2008+2009+2007+2009*97

问题描述:

简便运算.2008+2009+2007+2009*97

2008+2009+2007+2009*97
=2009-1+2009+2009-2+2009×97
=2009×(97+3)-1-2
=200900-3
=200897