若a,x属于R,集合A={2,4,x^2减5x+9},B={3,x^2+ax+a},C={x^2+(a+1)x减3,1}求(1)使A={2,3,4}的x的值 (2)使...若a,x属于R,集合A={2,4,x^2减5x+9},B={3,x^2+ax+a},C={x^2+(a+1)x减3,1}求(1)使A={2,3,4}的x的值 (2)使B=C的a,x的值 急
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![若a,x属于R,集合A={2,4,x^2减5x+9},B={3,x^2+ax+a},C={x^2+(a+1)x减3,1}求(1)使A={2,3,4}的x的值 (2)使...若a,x属于R,集合A={2,4,x^2减5x+9},B={3,x^2+ax+a},C={x^2+(a+1)x减3,1}求(1)使A={2,3,4}的x的值 (2)使B=C的a,x的值 急](/uploads/image/z/3764636-44-6.jpg?t=%E8%8B%A5a%2Cx%E5%B1%9E%E4%BA%8ER%2C%E9%9B%86%E5%90%88A%3D%7B2%2C4%2Cx%5E2%E5%87%8F5x%2B9%7D%2CB%3D%7B3%2Cx%5E2%2Bax%2Ba%7D%2CC%3D%7Bx%5E2%2B%28a%2B1%29x%E5%87%8F3%2C1%7D%E6%B1%82%281%29%E4%BD%BFA%3D%7B2%2C3%2C4%7D%E7%9A%84x%E7%9A%84%E5%80%BC+%282%29%E4%BD%BF...%E8%8B%A5a%2Cx%E5%B1%9E%E4%BA%8ER%2C%E9%9B%86%E5%90%88A%3D%7B2%2C4%2Cx%5E2%E5%87%8F5x%2B9%7D%2CB%3D%7B3%2Cx%5E2%2Bax%2Ba%7D%2CC%3D%7Bx%5E2%2B%28a%2B1%29x%E5%87%8F3%2C1%7D%E6%B1%82%281%29%E4%BD%BFA%3D%7B2%2C3%2C4%7D%E7%9A%84x%E7%9A%84%E5%80%BC+%282%29%E4%BD%BFB%3DC%E7%9A%84a%2Cx%E7%9A%84%E5%80%BC+%E6%80%A5)
若a,x属于R,集合A={2,4,x^2减5x+9},B={3,x^2+ax+a},C={x^2+(a+1)x减3,1}求(1)使A={2,3,4}的x的值 (2)使...若a,x属于R,集合A={2,4,x^2减5x+9},B={3,x^2+ax+a},C={x^2+(a+1)x减3,1}求(1)使A={2,3,4}的x的值 (2)使B=C的a,x的值 急
若a,x属于R,集合A={2,4,x^2减5x+9},B={3,x^2+ax+a},C={x^2+(a+1)x减3,1}求(1)使A={2,3,4}的x的值 (2)使...
若a,x属于R,集合A={2,4,x^2减5x+9},B={3,x^2+ax+a},C={x^2+(a+1)x减3,1}求(1)使A={2,3,4}的x的值 (2)使B=C的a,x的值 急
若a,x属于R,集合A={2,4,x^2减5x+9},B={3,x^2+ax+a},C={x^2+(a+1)x减3,1}求(1)使A={2,3,4}的x的值 (2)使...若a,x属于R,集合A={2,4,x^2减5x+9},B={3,x^2+ax+a},C={x^2+(a+1)x减3,1}求(1)使A={2,3,4}的x的值 (2)使B=C的a,x的值 急
1.x=2,x=3 2.x=-1 a=-6 或者 x=3 a=-2
(1)x^2-5x+9=3
x^2-5x+6=0
(x-2)(x-3)=0
x=2或3
(2)x^2+ax+a=1
x^2+(a+1)x-3=3
两式相减
x-3-a=2
x=5+a
(5+a)^2+a(5+a)+a=1
25+a^2+10a+5a+a^2+a-1=0
a^2+8a+12=0
a=-2或a=-6
x=3或x=-1