已知集合M={yly=x²-4x+3,x∈R},N={yly=-x²+2x+8,x∈R},求M∩N
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![已知集合M={yly=x²-4x+3,x∈R},N={yly=-x²+2x+8,x∈R},求M∩N](/uploads/image/z/13354272-0-2.jpg?t=%E5%B7%B2%E7%9F%A5%E9%9B%86%E5%90%88M%3D%7Byly%3Dx%26%23178%3B-4x%2B3%2Cx%E2%88%88R%7D%2CN%3D%7Byly%3D-x%26%23178%3B%2B2x%2B8%2Cx%E2%88%88R%7D%2C%E6%B1%82M%E2%88%A9N)
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已知集合M={yly=x²-4x+3,x∈R},N={yly=-x²+2x+8,x∈R},求M∩N
已知集合M={yly=x²-4x+3,x∈R},N={yly=-x²+2x+8,x∈R},求M∩N
已知集合M={yly=x²-4x+3,x∈R},N={yly=-x²+2x+8,x∈R},求M∩N
M = {y l y = x² - 4x + 3,x∈R} = {y l y = (x - 2)² - 1,x∈R} = [-1 ,+∞)
N = {y l y = -x² + 2x + 8,x∈R} = {y l y = - (x - 1)² + 9 ,x∈R} = (-∞ ,9]
M ∩ N = [-1 ,9]