Question

Tìm x:

x - 25%x = \(\dfrac{1}{2}\)

Answer 1

\(x-25\%.x=\dfrac{1}{2}\)

\(x-\dfrac{25}{100}x=\dfrac{1}{2}\)

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

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

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

\(x=\dfrac{1}{2}:\dfrac{3}{4}\)

\(x=\dfrac{2}{3}\)

Vậy \(x=\dfrac{2}{3}\) là giá trị cần tìm

Answer 2

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

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

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

\(\Rightarrow\) \(x=\dfrac{1}{2}:\dfrac{3}{4}=\dfrac{2}{3}\)

Ai thấy đúng thì ủng hộ nha !!!