已知集合A=﹛X|X²-2X-3﹥0﹜,B=﹛x|x²+ax+b≤0﹜且A∪B=R,A∩B=﹛x|x<3≤4﹜求ab的值
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![已知集合A=﹛X|X²-2X-3﹥0﹜,B=﹛x|x²+ax+b≤0﹜且A∪B=R,A∩B=﹛x|x<3≤4﹜求ab的值](/uploads/image/z/1252838-38-8.jpg?t=%E5%B7%B2%E7%9F%A5%E9%9B%86%E5%90%88A%3D%EF%B9%9BX%7CX%26%23178%3B%EF%BC%8D2X%EF%BC%8D3%EF%B9%A50%EF%B9%9C%2CB%3D%EF%B9%9Bx%7Cx%26%23178%3B%EF%BC%8Bax%2Bb%E2%89%A40%EF%B9%9C%E4%B8%94A%E2%88%AAB%3DR%2CA%E2%88%A9B%3D%EF%B9%9Bx%7Cx%EF%BC%9C3%E2%89%A44%EF%B9%9C%E6%B1%82ab%E7%9A%84%E5%80%BC)
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已知集合A=﹛X|X²-2X-3﹥0﹜,B=﹛x|x²+ax+b≤0﹜且A∪B=R,A∩B=﹛x|x<3≤4﹜求ab的值
已知集合A=﹛X|X²-2X-3﹥0﹜,B=﹛x|x²+ax+b≤0﹜且A∪B=R,A∩B=﹛x|x<3≤4﹜求ab的值
已知集合A=﹛X|X²-2X-3﹥0﹜,B=﹛x|x²+ax+b≤0﹜且A∪B=R,A∩B=﹛x|x<3≤4﹜求ab的值
B={x|-1