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y=1/√(x²;+x+1)因為x²;+x+1=(x+1/2)²;+3/4>0恒成立定義域為R對於x²;+x+1可以看作開口向上,對稱軸為x=-1/2的抛物線在(-∞,-1/2]减函數[-1/2,+∞)增函數所以原函數在(-∞,-1/2]增函數[-1/2,+∞)减…
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