设全集U={-1/3,5,-3},-1/3是A={}与B={}的公共元素,求CuA,CuB.
人气:172 ℃ 时间:2019-08-21 13:21:30
解答
将-1/3代入到集合A中的条件中,3*(-1/3)^2+p*(-1/3)-5=0解出p=-14所以A={x|3x^2-14x-5=0}={-1/3 ,5}将-1/3代入到集合B中的条件中,3*(-1/3)^2+10*(-1/3)+q=0解出q=3所以B={x|3x^2+10x+3=0}={-1/3 ,-3}所以CuA={-3}...
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