30.4-(10.4-2.91) 怎么简便?把括号去掉不行的
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:2024/07/08 22:46:54
30.4-(10.4-2.91) 怎么简便?把括号去掉不行的
![30.4-(10.4-2.91) 怎么简便?把括号去掉不行的](/uploads/image/z/19555200-0-0.jpg?t=30.4-%EF%BC%8810.4-2.91%EF%BC%89+%E6%80%8E%E4%B9%88%E7%AE%80%E4%BE%BF%3F%E6%8A%8A%E6%8B%AC%E5%8F%B7%E5%8E%BB%E6%8E%89%E4%B8%8D%E8%A1%8C%E7%9A%84)
一楼的,这和去括号没什么区别
30.4-(10.4-2.91)
=30.4×100-(10.4×100-100×2.91)÷100
={3040-【1040+9-(291+9)】}÷100
={3040-749}÷100
=2291÷100
=22.91
30.4-(10.4-2.91)
=30.4×100-(10.4×100-100×2.91)÷100
={3040-【1040+9-(291+9)】}÷100
={3040-749}÷100
=2291÷100
=22.91