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f(x)=x^3+3x^2+19, 若a,b為實數且f(a)=27,f(b)=15, a+b=?

f(x)=x^3+3x^2+19, 若a,b為實數且f(a)=27,f(b)=15, a+b=?

f(x)=x^3+3x^2+19
若a,b為實數且f(a)=27,f(b)=15
試求a+b=

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