y= x/(x+1), -1<x<1,求 y的取值范围?
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y= x/(x+1)
=1 -1/(x+1)
lim(x->-1+) [1 -1/(x+1)] ->-无穷
y'=1/(x+1)^2 >0
lim(x->1) [1 -1/(x+1)] = 1-1/2 =1/2
取值范围 =(-无穷, 1/2)
=1 -1/(x+1)
lim(x->-1+) [1 -1/(x+1)] ->-无穷
y'=1/(x+1)^2 >0
lim(x->1) [1 -1/(x+1)] = 1-1/2 =1/2
取值范围 =(-无穷, 1/2)
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