CÁC BẠN ƯI, GIÚP MIK MẤY BÀI NÀY NHA
\(\frac{\frac{3}{41}-\frac{12}{47}+\frac{27}{53}}{\frac{4}{41}-\frac{16}{47}+\frac{36}{53}}=?\)\(4+2^2+2^4+...+2^{20}\)\(\frac{5^2}{1.6}+\frac{5^2}{6.11}+\frac{^{5^2}}{11.16}+\frac{5^2}{16.21}+\frac{5^2}{21.26}+\frac{5^2}{26.31}\)