=(√（x+h）-√x)/h =(√（x+h）-√x)(√（x+h）+√x)/h*(√（x+h）+√x)=1/(√（x+h）+√x)
趋近于=1/2√x
设f(x)=√x,求limf(x+h)-f(x)/h (h趋向于0)
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