U {0,1,2,3,4} A{x丨x^2-5x+m=0} x属于U 求CuA ,m
人气:481 ℃ 时间:2020-05-27 01:03:05
解答
因A={X∈U|X^2-5X+m=0},
由韦达定理得:X1+X2=5,X1*X2=m.
可得:X1=1,X2=4,m=4;
或X1=2,X2=3,m=6.
于是A={1,2,3,4}.
A的补集={5}.
m=4或6.
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