几道不等式1.不等式x方+mx+2<0的解集为空集,则m的范围是2.不等式x方+mx+2≥0的解集为R,则m的范围是3.不等式ax方+5x+c>0的解集为{x|1/3
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![几道不等式1.不等式x方+mx+2<0的解集为空集,则m的范围是2.不等式x方+mx+2≥0的解集为R,则m的范围是3.不等式ax方+5x+c>0的解集为{x|1/3](/uploads/image/z/11507400-0-0.jpg?t=%E5%87%A0%E9%81%93%E4%B8%8D%E7%AD%89%E5%BC%8F1.%E4%B8%8D%E7%AD%89%E5%BC%8Fx%E6%96%B9%2Bmx%2B2%EF%BC%9C0%E7%9A%84%E8%A7%A3%E9%9B%86%E4%B8%BA%E7%A9%BA%E9%9B%86%2C%E5%88%99m%E7%9A%84%E8%8C%83%E5%9B%B4%E6%98%AF2.%E4%B8%8D%E7%AD%89%E5%BC%8Fx%E6%96%B9%2Bmx%2B2%E2%89%A50%E7%9A%84%E8%A7%A3%E9%9B%86%E4%B8%BAR%2C%E5%88%99m%E7%9A%84%E8%8C%83%E5%9B%B4%E6%98%AF3.%E4%B8%8D%E7%AD%89%E5%BC%8Fax%E6%96%B9%2B5x%2Bc%EF%BC%9E0%E7%9A%84%E8%A7%A3%E9%9B%86%E4%B8%BA%7Bx%7C1%2F3)
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