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Answers for “幂法则如何应用于负整数指数?”

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To apply the power rule, bring the fixed exponent n down as a coefficient and reduce the exponent by one, yielding f'(x) = nx^{n-1}. The source presents this as an application shortcut for its displayed n≠0n\ne 0 examples, deferring proofs to later lessons.

Conditions: n is a fixed real exponent.; Work on x>0x>0 as the common real domain; positive integer powers extend over all real x and negative integer powers exclude x=0x=0.; The source presents n≠0n\ne 0; the constant n=0n=0 case is treated separately.

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To find the derivative of a polynomial function like f(x)=x2f(x) = x^2, identify the exponent n and apply the power rule f'(x) = nx^{n-1}. Bring the exponent down as a coefficient and reduce it by one.

Conditions: n is a fixed real exponent.; Use x>0x>0 as the common real domain; positive integer powers extend over all real x and negative integer powers exclude x=0x=0.; The source presents n≠0n\ne 0; the constant n=0n=0 case is treated separately.