求y=(1/(x+1) )+x的极值

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求y=(1/(x+1))+x的极值求y=(1/(x+1))+x的极值求y=(1/(x+1))+x的极值y=(1/(x+1))+xxy+y=1+x²+xx²+(1-y)x+(1-y)

求y=(1/(x+1) )+x的极值
求y=(1/(x+1) )+x的极值

求y=(1/(x+1) )+x的极值
y=(1/(x+1) )+x
xy+y=1+x²+x
x²+(1-y)x+(1-y)=0
x是实数
△=(1-y)²-4(1-y)≥0
y≤-3