已知集合A={x|y=√x^2-5x-14},集合B={x|y=lg(-x^2-7x-12)},集合C={x|m+1≤x≤2m-1},则A∩B等于多少②若A∪C=A则m取值范围
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![已知集合A={x|y=√x^2-5x-14},集合B={x|y=lg(-x^2-7x-12)},集合C={x|m+1≤x≤2m-1},则A∩B等于多少②若A∪C=A则m取值范围](/uploads/image/z/10140880-40-0.jpg?t=%E5%B7%B2%E7%9F%A5%E9%9B%86%E5%90%88A%3D%7Bx%7Cy%3D%E2%88%9Ax%5E2-5x-14%7D%2C%E9%9B%86%E5%90%88B%3D%7Bx%7Cy%3Dlg%28-x%5E2-7x-12%29%7D%2C%E9%9B%86%E5%90%88C%3D%7Bx%7Cm%2B1%E2%89%A4x%E2%89%A42m-1%7D%2C%E5%88%99A%E2%88%A9B%E7%AD%89%E4%BA%8E%E5%A4%9A%E5%B0%91%E2%91%A1%E8%8B%A5A%E2%88%AAC%EF%BC%9DA%E5%88%99m%E5%8F%96%E5%80%BC%E8%8C%83%E5%9B%B4)
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