求函数的值域:y=(x^2+4x+5)/(x+1)
人气:375 ℃ 时间:2020-05-09 21:54:13
解答
y=(x^2+4x+5)/(x+1)
y(x+1)=(x^2+4x+5)
x^2+(4-y)x+5-y=0
△=(4-y)^2-4(5-y)=y^2-4y-4≥0
y≥2+2√2,或,y≤2-2√2
值域:(-∞,2-2√2]U[2+2√2,+∞)
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