已知a,x∈R,A={2,4,x²-5x+9},B={3,x²+ax+a},C={x²+(a+1)x-3,1} 求(1)使A={2,3,4}的x的值 (2)使2∈B,B是A的真子集的a,x的值 (3)使B=C的a,x的值
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![已知a,x∈R,A={2,4,x²-5x+9},B={3,x²+ax+a},C={x²+(a+1)x-3,1} 求(1)使A={2,3,4}的x的值 (2)使2∈B,B是A的真子集的a,x的值 (3)使B=C的a,x的值](/uploads/image/z/2545068-12-8.jpg?t=%E5%B7%B2%E7%9F%A5a%2Cx%E2%88%88R%2CA%3D%7B2%2C4%2Cx%26%23178%3B-5x%2B9%7D%2CB%3D%7B3%2Cx%26%23178%3B%2Bax%2Ba%7D%2CC%3D%EF%BD%9Bx%26%23178%3B%2B%EF%BC%88a%2B1%EF%BC%89x-3%2C1%7D+%E6%B1%82%EF%BC%881%EF%BC%89%E4%BD%BFA%3D%7B2%2C3%2C4%7D%E7%9A%84x%E7%9A%84%E5%80%BC+%EF%BC%882%EF%BC%89%E4%BD%BF2%E2%88%88B%2CB%E6%98%AFA%E7%9A%84%E7%9C%9F%E5%AD%90%E9%9B%86%E7%9A%84a%2Cx%E7%9A%84%E5%80%BC+%EF%BC%883%EF%BC%89%E4%BD%BFB%3DC%E7%9A%84a%2Cx%E7%9A%84%E5%80%BC)
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已知a,x∈R,A={2,4,x²-5x+9},B={3,x²+ax+a},C={x²+(a+1)x-3,1} 求(1)使A={2,3,4}的x的值 (2)使2∈B,B是A的真子集的a,x的值 (3)使B=C的a,x的值
已知a,x∈R,A={2,4,x²-5x+9},B={3,x²+ax+a},C={x²+(a+1)x-3,1} 求(1)使A={2,3,4}的x的值 (2)使2∈B,B是A的真子集的a,x的值 (3)使B=C的a,x的值
已知a,x∈R,A={2,4,x²-5x+9},B={3,x²+ax+a},C={x²+(a+1)x-3,1} 求(1)使A={2,3,4}的x的值 (2)使2∈B,B是A的真子集的a,x的值 (3)使B=C的a,x的值
1、x²-5x+9=3
x=2 或 x=3
2、2∈B
x²+ax+a=2
少条件
3、x²+ax+a=1
x²+(a+1)x-3=3
a=-4
x=-1