当x取何值时,2x+1与-1/2x-2的值,(1)相等(2)互为相反数(请写步骤.谢谢!)
来源:学生作业帮助网 编辑:作业帮 时间:2024/06/22 03:10:33
![当x取何值时,2x+1与-1/2x-2的值,(1)相等(2)互为相反数(请写步骤.谢谢!)](/uploads/image/z/13892282-26-2.jpg?t=%E5%BD%93x%E5%8F%96%E4%BD%95%E5%80%BC%E6%97%B6%2C2x%2B1%E4%B8%8E-1%2F2x-2%E7%9A%84%E5%80%BC%2C%EF%BC%881%EF%BC%89%E7%9B%B8%E7%AD%89%EF%BC%882%EF%BC%89%E4%BA%92%E4%B8%BA%E7%9B%B8%E5%8F%8D%E6%95%B0%28%E8%AF%B7%E5%86%99%E6%AD%A5%E9%AA%A4.%E8%B0%A2%E8%B0%A2%21%29)
当x取何值时,2x+1与-1/2x-2的值,(1)相等(2)互为相反数(请写步骤.谢谢!)
当x取何值时,2x+1与-1/2x-2的值,(1)相等(2)互为相反数(请写步骤.谢谢!)
当x取何值时,2x+1与-1/2x-2的值,(1)相等(2)互为相反数(请写步骤.谢谢!)
解
因为相等
∴2x+1=-1/2x-2
∴4x+2=-x-4
∴5x=-6
∴x=-6/5
∵互为相反数
∴(2x+1)+(-1/2x-2)=0
即4x+2-x-4=0
∴3x=2
∴x=2/3