Question

giúp mik vs ạ

Answer 1

a) \(\dfrac{4}{3}+\left(1,25-x\right)=2,25\)

\(\Rightarrow\dfrac{4}{3}+\left(\dfrac{5}{4}-x\right)=\dfrac{9}{4}\)

\(\Rightarrow\dfrac{5}{4}-x=\dfrac{9}{4}-\dfrac{4}{3}\)

\(\Rightarrow\dfrac{5}{4}-x=\dfrac{11}{12}\)

\(\Rightarrow x=\dfrac{5}{4}-\dfrac{11}{12}\)

\(\Rightarrow x=\dfrac{1}{3}\)

b) \(8,25-x=3\dfrac{1}{6}+\dfrac{-9}{10}\)

\(\Rightarrow\dfrac{33}{4}-x=\dfrac{19}{6}-\dfrac{9}{10}\)

\(\Rightarrow\dfrac{33}{4}-x=\dfrac{34}{15}\)

\(\Rightarrow x=\dfrac{33}{4}-\dfrac{34}{15}\)

\(\Rightarrow x=\dfrac{359}{60}\)

c) \(\dfrac{11}{13}-\left(\dfrac{5}{12}-x\right)=-\left(\dfrac{15}{28}-\dfrac{11}{13}\right)\)

\(\Rightarrow\dfrac{11}{13}-\dfrac{5}{12}+x=-\dfrac{15}{28}+\dfrac{11}{13}\)

\(\Rightarrow-\dfrac{5}{12}+x=-\dfrac{15}{28}+\dfrac{11}{13}-\dfrac{11}{13}\)

\(\Rightarrow-\dfrac{5}{12}+x=-\dfrac{15}{28}\)

\(\Rightarrow x=-\dfrac{15}{28}+\dfrac{5}{12}\)

\(\Rightarrow x=-\dfrac{5}{42}\)