8.6×34.5+0.345×140简便计算
问题描述：
8.6×34.5+0.345×140简便计算
答
合并同类项
答
.
答
=8.6×34.5+0.345×140
=8.6×34.5+34.5×1.4
=34.5×(1.4+8.6)
=34.5×10=345