若不等式3x+a>7的解集为X≥4.试求a的值 (我的疑问在括号里!)3x+a>7 ,x>(7-a)/3 ,因为解集为x≥4,所以(7-a)/3=4,7-a=12,a=-5(“解集为x≥4”,那答案为什么不是a≥5而是a=-5呢?)
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![若不等式3x+a>7的解集为X≥4.试求a的值 (我的疑问在括号里!)3x+a>7 ,x>(7-a)/3 ,因为解集为x≥4,所以(7-a)/3=4,7-a=12,a=-5(“解集为x≥4”,那答案为什么不是a≥5而是a=-5呢?)](/uploads/image/z/2830000-40-0.jpg?t=%E8%8B%A5%E4%B8%8D%E7%AD%89%E5%BC%8F3x%2Ba%3E7%E7%9A%84%E8%A7%A3%E9%9B%86%E4%B8%BAX%E2%89%A54.%E8%AF%95%E6%B1%82a%E7%9A%84%E5%80%BC+%EF%BC%88%E6%88%91%E7%9A%84%E7%96%91%E9%97%AE%E5%9C%A8%E6%8B%AC%E5%8F%B7%E9%87%8C%21%EF%BC%893x%2Ba%EF%BC%9E7+%2Cx%3E%287-a%29%2F3+%2C%E5%9B%A0%E4%B8%BA%E8%A7%A3%E9%9B%86%E4%B8%BAx%E2%89%A54%2C%E6%89%80%E4%BB%A5%287-a%29%2F3%3D4%2C7-a%3D12%2Ca%3D-5%EF%BC%88%E2%80%9C%E8%A7%A3%E9%9B%86%E4%B8%BAx%E2%89%A54%E2%80%9D%2C%E9%82%A3%E7%AD%94%E6%A1%88%E4%B8%BA%E4%BB%80%E4%B9%88%E4%B8%8D%E6%98%AFa%E2%89%A55%E8%80%8C%E6%98%AFa%3D-5%E5%91%A2%3F%EF%BC%89)
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