Hàm số f(x)= log(x^ 2019 - 2020x) có đạo hàm là

f'x=x2019−2020x.ln102019x2018−2020

f'x=x2019−2020x2019x2018−2020.ln2018

f'x=2019x2018−2020logex2019−2020x

f'x=2019x2018−2020ln10x2019−2020x