(5.4-2.4÷3)×1.7 用合适 方法计算下面各题 快
来源:学生作业帮 编辑:搜搜做题作业网作业帮 分类:数学作业 时间:2024/05/16 13:23:23
(5.4-2.4÷3)×1.7 用合适 方法计算下面各题 快
(5.4-2.4÷3)×1.7
=(5.4-0.8)×1.7
=4.6×1.7
=5×1.7 -0.4×1.7
=8.5-0.68
=7.82
再问: 为什么4.6×1.7后面就5×1.7 -0.4×1.7 了呢
再答: 4.6×1.7 =(5 -0.4)×1.7 =5×1.7 -0.4×1.7
=(5.4-0.8)×1.7
=4.6×1.7
=5×1.7 -0.4×1.7
=8.5-0.68
=7.82
再问: 为什么4.6×1.7后面就5×1.7 -0.4×1.7 了呢
再答: 4.6×1.7 =(5 -0.4)×1.7 =5×1.7 -0.4×1.7