设f(根号下x)=1/X+2根号下x.求f(x)的表达示.解不等式f(x)-x>2.
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设f(根号下x)=1/X+2根号下x.求f(x)的表达示.解不等式f(x)-x>2.
设f(根号下x)=1/X+2根号下x.求f(x)的表达示.解不等式f(x)
-x>2.
设f(根号下x)=1/X+2根号下x.求f(x)的表达示.解不等式f(x)-x>2.
f(√x)=1/x +2√x let √x =t => x=t^2 ;x≠0 =>t≠0
=>f(t)=1/(t^2) +2t
=>再变换变数 f(x)= 1/(x^2) +2x ;x≠0