n={y|y=-x²+4≤4}=(-∞,4]
m={y|y=x²+2x+3=(x+1)²+2≥2}=[2,+∞)
∴m∩n=[2,4],m∪n=(-∞,+∞)=R
求解n＝｛y｜y＝－x^²＋4｝和m＝｛y｜y＝x^²＋2x＋3｝的值域,求m∩n..m∪n
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