Question

nahnh nhé trước 2:45 hứa sẽ tick

Answer 1

Bài 1: 

a: \(=936-508+8\cdot\left(5^2+1\right)=428+8\cdot26=636\)

b: \(=\dfrac{2^6\cdot2\cdot3^2+2^7}{2^6\cdot5^2-2^6\cdot3}=\dfrac{2^7\cdot10}{2^6\cdot22}=\dfrac{10}{11}\)

c: \(=-\left(\dfrac{1}{2}+\dfrac{1}{6}+...+\dfrac{1}{90}\right)\)

\(=-\left(1-\dfrac{1}{2}+\dfrac{1}{2}-\dfrac{1}{3}+...+\dfrac{1}{9}-\dfrac{1}{10}\right)\)

=-9/10