Question

17．计算：37.8×8.3+17.9×17+1.7×158.8+1129．

Answer 1

分析 先把算式变形为3.78×83+17.9×17+17×15.88+1129，再根据乘法的分配律简算．

解答 解：37.8×8.3+17.9×17+1.7×158.8+1129
=3.78×83+17.9×17+17×15.88+1129
=3.78×83+（17.9+15.88）×17+1129
=3.78×83+33.78×17+1129
=3.78×83+（30+3.78）×17+1129
=3.78×83+30×17+3.78×17+1129
=3.78×（83+17）+510+1129
=3.78×100+510+1129
=378+510+1129
=888+1129
=2017

点评 此题重点考查了学生对运算定律的掌握与运用情况，要结合数据的特征，灵活选择简算方法．