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The function f is defined by ƒ (x)=√x−10 for all positive numbers x. If u = f(t) for some positive numbers t and u. What is t in terms of u?
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根据等式可知f（t）＝根号t－10，又因为u=f(t), then u=根号t－10，根号t＝10+u, t=(10+u)^2,因此可得出d
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