\(a,x+\dfrac{1}{2}=\dfrac{5}{4}\Leftrightarrow x=\dfrac{5}{4}-\dfrac{1}{2}=\dfrac{3}{4}\)
\(b,x-\dfrac{2}{3}=\dfrac{19}{20}\Leftrightarrow x=\dfrac{19}{20}+\dfrac{2}{3}=\dfrac{97}{60}\)
\(c,\dfrac{5}{3}-x=\dfrac{4}{7}\Leftrightarrow x=\dfrac{5}{3}-\dfrac{4}{7}=\dfrac{23}{21}\)
Bài 9:
a: \(\Leftrightarrow x+\dfrac{5}{2}=\dfrac{28-9}{12}=\dfrac{19}{12}\)
hay \(x=\dfrac{19}{12}-\dfrac{5}{2}=\dfrac{19}{12}-\dfrac{30}{12}=\dfrac{-11}{12}\)
b: \(\Leftrightarrow x-\dfrac{5}{6}=\dfrac{-32}{12}+\dfrac{39}{12}=\dfrac{7}{12}\)
hay \(x=\dfrac{7}{12}+\dfrac{5}{6}=\dfrac{17}{12}\)
c: \(\Leftrightarrow x-\dfrac{3}{2}=\dfrac{40}{35}-\dfrac{63}{35}=\dfrac{-23}{35}\)
hay \(x=\dfrac{-23}{35}+\dfrac{3}{2}=\dfrac{-46+105}{70}=\dfrac{59}{70}\)
d: \(\Leftrightarrow x=\dfrac{15}{8}+\dfrac{3}{4}+\dfrac{7}{2}=\dfrac{15}{8}+\dfrac{6}{8}+\dfrac{28}{8}=\dfrac{49}{8}\)
Anh thấy có khá nhiều bài á em, mà em nhắm mình làm được bài nào để mọi người khỏi giúp, đêm xuống, não cũng lười em ạ
