3×77+2010×5+201×49简便算法
问题描述:
3×77+2010×5+201×49简便算法
答
= 3 x 77 + 2010 x 5 + 201 x 49
= 231 + 2010 x 5 + 2010 x 4.9
= 231 + 2010 x (10 - 0.1)
= 231 + 20100 - 201
= 20100+ 30
= 20130