作业帮f(x)=(x-1)/(x+2)
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f(x)=(x-1)/(x+2)
f(x)=(x-1)/(x+2)
f(x)=(x-1)/(x+2)
f(x)=(x-1)/(x+2)=1- 3/(x+2)
(要求f(x)的增区间,即是3/(x+2)的减区间)
x+2>0时,即x>-2时,3/(x+2)单调递减,f(x)单调递增；
x+2
f(x)={2x+1,x
f(x)={1+x/2,x
f(x)=(x-1)/(x+2)
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