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20. μ€μ μ 체μ μ§ν©μμ λ―ΈλΆκ°λ₯ν ν¨μ \( f(x) \)κ° λ€μ 쑰건μ λ§μ‘±μν¨λ€. \begin{itemize} \item[(κ°)] λ«νκ΅¬κ° \([0, 1]\)μμ \( f(x) = x \)μ΄λ€. \item[(λ)] μ΄λ€ μμ \( a, b \)μ λνμ¬ κ΅¬κ° \([0, \infty)\)μμ \( f(x+1) - x f(x) = ax + b \)μ΄λ€. \end{itemize} \[ 60 \times \int_1^2 f(x) \, dx \] μ κ°μ ꡬνμμ€. [4μ ] |