用简便方法计算:2/15×4.69+3.21×152/15+7.9÷15/13
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:2024/07/04 01:30:16
用简便方法计算:2/15×4.69+3.21×152/15+7.9÷15/13
我感激不尽.
我感激不尽.
![用简便方法计算:2/15×4.69+3.21×152/15+7.9÷15/13](/uploads/image/z/327650-50-0.jpg?t=%E7%94%A8%E7%AE%80%E4%BE%BF%E6%96%B9%E6%B3%95%E8%AE%A1%E7%AE%97%EF%BC%9A2%2F15%C3%974.69%2B3.21%C3%97152%2F15%2B7.9%C3%B715%2F13)
原式=(2×(4.69+3.21)+150*3.21+7.9*13)/15
=(2*7.9+150*3.21+7.9*13)/15
=(15*7.9+150*3.21)/15
=7.9+32.1
=40
=(2*7.9+150*3.21+7.9*13)/15
=(15*7.9+150*3.21)/15
=7.9+32.1
=40