To simplify the expression 2/1 + 5/4 - 2/1 + 5/4, we need to find a common denominator for all four fractions before adding or subtracting them.
The common denominator for 2/1 and 2/1 is 1, since both fractions already have the same denominator.
The common denominator for 5/4 and 5/4 is 4, since both fractions already have the same denominator.
Therefore, the simplified expression is:
2/1 + 5/4 - 2/1 + 5/4
= (2 + 5)/1 + (5 + 5)/4
= 7/1 + 10/4
= 7 + 10/4
= (7*4 + 10)/4
= (28 + 10)/4
= 38/4
= 19/2
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随后，全自动包装机“大展拳脚”，按照设定好的程序打包烧卖。，进行圆桌对话，沟通交流投顾业务等主题。
市公安局张湾区分局刑警大队民警王毅凡提醒广大市民，公检法等部门根本不存在所谓的“安全账户”，凡通过电话、短信要求对自己的存款进行银行转账汇款的，或声称对资金进行审查的，请一概不要相信。，这时发现，司机言语不清且身上还有浓重酒气，派出所民警通知交警进行处理。
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