34.7*69+65.3*31+30.6*19怎么用简便方法计算
问题描述:
34.7*69+65.3*31+30.6*19怎么用简便方法计算
答
34.7*69+65.3*31+30.6*19
=34.7*69+34.7*31+30.6*31+30.6*19
=100*34.7+50*30.6
=3470+1530
=5000