1已知全集U=R,集合A={x|x²+ax+12b=0},B={x|x²-ax+b=0}满足(CuA)∩B={2},(CuB)∩A={4},求实数a,b的值2设全集U=R,A={x∈R|a≤x≤2},B=(x∈R|2x+1≤x+3,且3x≥2}.①若A包含B,求实数a的范围②若a=1,求A∪B,(CuA
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