a)
\(\dfrac{5}{4}-\dfrac{5}{6}:\left(\dfrac{3}{8}-\dfrac{1}{6}\right)+\dfrac{11}{12}\)
\(=\dfrac{5}{4}-\dfrac{5}{6}:\left(\dfrac{18}{48}-\dfrac{8}{48}\right)+\dfrac{11}{12}\)
\(=\dfrac{5}{4}-\dfrac{5}{6}:\dfrac{5}{24}+\dfrac{11}{12}\)
\(=\dfrac{5}{4}-\dfrac{5}{6}.\dfrac{24}{5}+\dfrac{11}{12}\)
\(=\dfrac{5}{4}-4+\dfrac{11}{12}\)
\(=\dfrac{-11}{4}+\dfrac{11}{12}\)
\(=\dfrac{-33}{12}+\dfrac{11}{12}\)
\(=\dfrac{-11}{6}\)
b)
\(\left(x-\dfrac{3}{5}\right):\dfrac{-1}{3}=0,4\)
\(\left(x-\dfrac{3}{5}\right):\dfrac{-1}{3}=\dfrac{2}{5}\)
\(\left(x-\dfrac{3}{5}\right)=\dfrac{2}{5}.\dfrac{-1}{3}\)
\(x-\dfrac{3}{5}=\dfrac{-2}{15}\)
\(x=\dfrac{-2}{15}+\dfrac{3}{5}\)
\(x=\dfrac{-2}{15}+\dfrac{9}{15}\)
\(x=\dfrac{7}{15}\)
=30/24-20/24:(9/24-4/24)+11/12
=30/24-20/24:5/24+11/12
=30/24-4+11/12
=-11/16
tìm x
(X-3/5):-1/3=0,4
(X-3/5)=0,4x-1/3
X-3/5=-2/15
X=-2/15+-3/5
X=-1/3
-1/3=-1 phần 3
giúp em với ạ ai làm đc thì em xin cảm ơn ạ em đang cần gấp được ko ạ
