2010/20112011-2011/20102010

问题描述:

2010/20112011-2011/20102010

2010×20112011-2011x20102010
=2010×2011×10001-2011x2010×10001
=2011x2010×10001-2011x2010×10001
=0

像这一类题 出题者的想法肯定不是硬算 我们应该想法设法把分子或者分母弄成一样的
2010/20112011-2011/20102010=2011/20112011-1/20112011-(2010/20102010+1/20102010)
=1/1001-1/20112011-(1/1001+1/20102010)
=-1/20112011--1/20102010 =-(20112011+20102010)/(20112011x20102010)

=2011/20112011-1/20112011-(2010/20102010+1/20102010)
=1/1001-1/20112011-(1/1001+1/20102010)
=-1/20112011--1/20102010