A={y|y=-x²+2,x∈R},B={y|y=-x+2,x∈R},则A∩B=
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A={y|y=-x²+2,x∈R},B={y|y=-x+2,x∈R},则A∩B=
A={y|y=-x²+2,x∈R},B={y|y=-x+2,x∈R},则A∩B=
A={y|y=-x²+2,x∈R},B={y|y=-x+2,x∈R},则A∩B=
A={y|y=-x²+2,x∈R},
y≤2
B={y|y=-x+2,x∈R},
y∈R
则A∩B=A={y|y≤2,y∈R}