1.已知关于x的一元二次方程3x²-7x+k+2=0的根的判别式等于289,求k的值,并解此一元二次方程.2.已知一元二次方程(m+1)x²-3x-2=0有实数根,试确定m的取值范围.3.m为何值时,关于x的方程2mx²+
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![1.已知关于x的一元二次方程3x²-7x+k+2=0的根的判别式等于289,求k的值,并解此一元二次方程.2.已知一元二次方程(m+1)x²-3x-2=0有实数根,试确定m的取值范围.3.m为何值时,关于x的方程2mx²+](/uploads/image/z/1791179-35-9.jpg?t=1.%E5%B7%B2%E7%9F%A5%E5%85%B3%E4%BA%8Ex%E7%9A%84%E4%B8%80%E5%85%83%E4%BA%8C%E6%AC%A1%E6%96%B9%E7%A8%8B3x%26%23178%3B-7x%2Bk%2B2%3D0%E7%9A%84%E6%A0%B9%E7%9A%84%E5%88%A4%E5%88%AB%E5%BC%8F%E7%AD%89%E4%BA%8E289%2C%E6%B1%82k%E7%9A%84%E5%80%BC%2C%E5%B9%B6%E8%A7%A3%E6%AD%A4%E4%B8%80%E5%85%83%E4%BA%8C%E6%AC%A1%E6%96%B9%E7%A8%8B.2.%E5%B7%B2%E7%9F%A5%E4%B8%80%E5%85%83%E4%BA%8C%E6%AC%A1%E6%96%B9%E7%A8%8B%EF%BC%88m%2B1%EF%BC%89x%26%23178%3B-3x-2%3D0%E6%9C%89%E5%AE%9E%E6%95%B0%E6%A0%B9%2C%E8%AF%95%E7%A1%AE%E5%AE%9Am%E7%9A%84%E5%8F%96%E5%80%BC%E8%8C%83%E5%9B%B4.3.m%E4%B8%BA%E4%BD%95%E5%80%BC%E6%97%B6%2C%E5%85%B3%E4%BA%8Ex%E7%9A%84%E6%96%B9%E7%A8%8B2mx%26%23178%3B%2B)
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