Question

Giải hộ
  

Answer 1

a) \(-\dfrac{8}{3}.\dfrac{2}{11}-\dfrac{8}{3}:\dfrac{11}{9}\)

\(=-\dfrac{8}{3}.\dfrac{2}{11}+-\dfrac{8}{3}.\dfrac{9}{11}\)

\(=-\dfrac{8}{3}\left(\dfrac{2}{11}+\dfrac{9}{11}\right)=-\dfrac{8}{3}.1=-\dfrac{8}{3}\)

b)  \(0,1\sqrt{400}+0,2\sqrt{1600}=\dfrac{1}{10}.\sqrt{20^2}+\dfrac{1}{5}.\sqrt{40^2}=\dfrac{1}{10}.20+\dfrac{1}{5}.40=2+8=10\)

c) \(A=\dfrac{1}{4}+-\dfrac{12}{19}+\dfrac{2}{9}-\dfrac{5}{4}+\dfrac{31}{19}\)

\(=\dfrac{1}{4}-\dfrac{5}{4}+\dfrac{31}{19}-\dfrac{12}{19}+\dfrac{2}{9}\)

\(=-1+1+\dfrac{2}{9}=\dfrac{2}{9}\)