2007×13/27+2007×19/27-2007×5/27简便计算!

问题描述:

2007×13/27+2007×19/27-2007×5/27简便计算!

2007×13/27+2007×19/27-2007×5/27
=2007×(13/27+19/27-5/27)
=2007×27/27
-2007

=2007×(13/27+19/27-5/27)
=2007×1
=2007