Cho hàm số f(a)=a^2/3(căn bậc 3 a^-1-căn bậc ba
Giải thích
Đáp án D
Ta có
fa=a23a−23−a3a18a38−a−18=a23a−23−a13a18a38−a−18=1−aa12−1=−a12−1a12+1a12−1=−a12−1.
Khi đó f20192018=−2019201812−1=−20191009−1.
Đáp án D
Ta có
fa=a23a−23−a3a18a38−a−18=a23a−23−a13a18a38−a−18=1−aa12−1=−a12−1a12+1a12−1=−a12−1.
Khi đó f20192018=−2019201812−1=−20191009−1.