已知U=R,A={x|x+2/3-x>=1},B={x|x²-3x-4
人气:152 ℃ 时间:2020-05-26 01:23:13
解答
x+2/3-x>=1,(x+2/x-3)+1≤0,2x-1/x-3≤0,0.5≤x<3
x²-3x-4
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