21.5乘1.9加2.15乘81 简便方法计算
问题描述:
21.5乘1.9加2.15乘81 简便方法计算
答
21.5乘1.9加2.15乘81 =21.5*1.9+21.5*8.1=21.5*(1.9+8.1)=21.5*10=215
21.5乘1.9加2.15乘81 简便方法计算
21.5乘1.9加2.15乘81 =21.5*1.9+21.5*8.1=21.5*(1.9+8.1)=21.5*10=215