设全集I={2,3,x²+2x-3},集合A={|2x-1|,2},C1A={5},求实数x的值?
人气:204 ℃ 时间:2020-01-27 14:22:26
解答
∵x^2+2x-3=5 & |2x-1|=3
∴x^2+2x-8=0& 4x^2-4x-8=0
=> [x1=2,x2=-4]&[x1=2 ,x2=-1]
∴x=2
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