Question

(\(3\dfrac{1}{2}\)- x).\(1\dfrac{1}{4}\)=\(-1\dfrac{1}{20}\)

ai nhanh tui tick cho

Answer 1

\(\left(3\dfrac{1}{2}-x\right).1\dfrac{1}{4}=-1\dfrac{1}{20}\)

\(\left(\dfrac{7}{2}-x\right).\dfrac{5}{4}=-\dfrac{21}{20}\)

\(\dfrac{7}{2}-x=-\dfrac{21}{20}:\dfrac{5}{4}\)

\(\dfrac{7}{2}-x=-\dfrac{21}{25}\)

\(x=\dfrac{7}{2}-\left(-\dfrac{21}{25}\right)\)

\(x=\dfrac{217}{50}\)

Vậy \(x=\dfrac{217}{50}\)\(\)

Answer 2

\(\left(3\dfrac{1}{2}-x\right).1\dfrac{1}{4}=-1\dfrac{1}{20}\)

\(\left(\dfrac{7}{2}-x\right).\dfrac{5}{4}=-\dfrac{21}{20}\)

\(\left(\dfrac{7}{2}-x\right)=-\dfrac{21}{25}\)

\(x=\dfrac{217}{50}\)

Answer 3

\(\left(3\dfrac{1}{2}-x\right).1\dfrac{1}{4}=-1\dfrac{1}{20}\)

\(\left(\dfrac{7}{2}-x\right).\dfrac{5}{4}=\dfrac{-21}{20}\)

\(\left(\dfrac{7}{2}-x\right)=\dfrac{-21}{20}:\dfrac{5}{4}\)

\(\dfrac{7}{2}-x=\dfrac{-21}{20}.\dfrac{4}{5}\)

\(\dfrac{7}{2}-x=\dfrac{\left(-21\right).4}{20.5}\)

\(\dfrac{7}{2}-x=\dfrac{\left(-21\right).1}{5.5}\)

\(\dfrac{7}{2}-x=\dfrac{-21}{25}\)

\(x=\dfrac{7}{2}-\dfrac{-21}{25}\)

\(x=\dfrac{175}{50}+\dfrac{42}{50}\)

\(x=\dfrac{217}{50}\)