已知A={y|y=x²-2x+3,X∈R},B={y|y=-x²+4s+1,X∈R},则(CRA)U(CRB)=______
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已知A={y|y=x²-2x+3,X∈R},B={y|y=-x²+4s+1,X∈R},则(CRA)U(CRB)=______
已知A={y|y=x²-2x+3,X∈R},B={y|y=-x²+4s+1,X∈R},则(CRA)U(CRB)=______
已知A={y|y=x²-2x+3,X∈R},B={y|y=-x²+4s+1,X∈R},则(CRA)U(CRB)=______
∵y=x²-2x+3,X∈R
=(x-1)²+2≥2
∴A={y|y≥2}
∵y=-x²+4x+1
=-(x-2)²+5≤5
∴B={y|y≤5}
∴CRA={y|y5}
∴(CRA)U(CRB)
={y|y5}