2.8乘以1.4+3.6乘以1.2怎样进行简便运算
更新时间：2026-09-30 03:14:46
问题描述:
2.8乘以1.4+3.6乘以1.2怎样进行简便运算
罗忠海回答:
2.8乘以1.4+3.6乘以1.2 =(3-0.2)*1.4+(4-0.4)*1.2 =4.2-0.28+4.8-0.48 =9-0.76 =8.24
2.8乘以1.4+3.6乘以1.2怎样进行简便运算
2.8乘以1.4+3.6乘以1.2 =(3-0.2)*1.4+(4-0.4)*1.2 =4.2-0.28+4.8-0.48 =9-0.76 =8.24