7.5*46.7+59.9*2.5
问题描述：
7.5*46.7+59.9*2.5
答
7.5*46.7+59.9*2.5
=2.5*3*46.7+59.9*2.5
=2.5*140.1+59.9*2.5
=2.5*(140.1+59.9)
=2.5*200
=500