题目是不是这样的?(-2009 5/6)+(-2008 2/3)+(-1 1/2)+4020 3/4
原式=-2000-9-2000-8-1+4000+20-5/6-2/3-1/2+3/4
=20-(9+1)-8+3/4-(5+4+3)/6
=2+3/4-2
=3/4
题目是不是这样的?(-2009 5/6)+(-2008 2/3)+(-1 1/2)+4020 3/4
原式=-2000-9-2000-8-1+4000+20-5/6-2/3-1/2+3/4
=20-(9+1)-8+3/4-(5+4+3)/6
=2+3/4-2
=3/4