已知关于X,Y的二元一次方程组 x+y>-7-a,x-y=1+3+a的解是x为非正数,y为负数 (1)a的取值范围,(2)化简│a-3│+│a+2│;(3)在a的取值范围内,当a为何值时,不等式2ax+x1
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![已知关于X,Y的二元一次方程组 x+y>-7-a,x-y=1+3+a的解是x为非正数,y为负数 (1)a的取值范围,(2)化简│a-3│+│a+2│;(3)在a的取值范围内,当a为何值时,不等式2ax+x1](/uploads/image/z/3699447-15-7.jpg?t=%E5%B7%B2%E7%9F%A5%E5%85%B3%E4%BA%8EX%2CY%E7%9A%84%E4%BA%8C%E5%85%83%E4%B8%80%E6%AC%A1%E6%96%B9%E7%A8%8B%E7%BB%84+x%2By%EF%BC%9E-7-a%2Cx-y%3D1%2B3%2Ba%E7%9A%84%E8%A7%A3%E6%98%AFx%E4%B8%BA%E9%9D%9E%E6%AD%A3%E6%95%B0%2Cy%E4%B8%BA%E8%B4%9F%E6%95%B0+%EF%BC%881%EF%BC%89a%E7%9A%84%E5%8F%96%E5%80%BC%E8%8C%83%E5%9B%B4%2C%EF%BC%882%EF%BC%89%E5%8C%96%E7%AE%80%E2%94%82a-3%E2%94%82%2B%E2%94%82a%2B2%E2%94%82%EF%BC%9B%EF%BC%883%EF%BC%89%E5%9C%A8a%E7%9A%84%E5%8F%96%E5%80%BC%E8%8C%83%E5%9B%B4%E5%86%85%EF%BC%8C%E5%BD%93a%E4%B8%BA%E4%BD%95%E5%80%BC%E6%97%B6%EF%BC%8C%E4%B8%8D%E7%AD%89%E5%BC%8F2ax%2Bx1)
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