2007÷(2007+2007/2008)+1/2009

问题描述:

2007÷(2007+2007/2008)+1/2009

=2007÷[2007×(1+1/2008)]+1/2009
=2008/2009+1/2009
=1

=2007÷[2007×(1+1/2008)]+1/2009
=1÷(1+1/2008)+1/2009
=2008/2009+1/2009
=1