设f(x)=√x,求limf(x+h)-f(x)/h (h趋向于0)
3个回答
=(√(x+h)-√x)/h =(√(x+h)-√x)(√(x+h)+√x)/h*(√(x+h)+√x)=1/(√(x+h)+√x)
趋近于=1/2√x
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