下列各函数中,最小值为2的是—y=(x²+3)/(x²+2)怎么解释最小值不等于2?

Question

下列各函数中,最小值为2的是—y=(x²+3)/(x²+2)怎么解释最小值不等于2?

Answer 1

y=(x²+2+1)/(x²+2)
=1+1/(x²+2)
x²+2≥2
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