Question

40%x - x - 1/8 = 3/4

Answer 1

40%x - x - 1/8=3/4

2/5x - x = 3/4 +1/8

-3/5x = 7/8

x = 7/8:-3/5

x = -35/24

Answer 2

40%x - x - \(\dfrac{1}{8}=\dfrac{3}{4}\)

\(\dfrac{2}{5}\)x - x = \(\dfrac{3}{4}+\dfrac{1}{8}\)

x .\(\left(\dfrac{2}{5}-1\right)\) = \(\dfrac{6}{8}+\dfrac{1}{8}\)

x. \(\left(\dfrac{2}{5}-\dfrac{5}{5}\right)\) = \(\dfrac{7}{8}\)

x. \(\dfrac{-3}{5}\) = \(\dfrac{7}{8}\)

x = \(\dfrac{7}{8}\):\(\dfrac{-3}{5}\)

x = \(\dfrac{7}{8}.\dfrac{5}{-3}\)

x = \(\dfrac{-35}{24}\)

Vậy x = \(\dfrac{-35}{24}\)

Answer 3

Lời giải:

\(40\%x-x-\dfrac{1}{8}=\dfrac{3}{4}\)

\(\Rightarrow\dfrac{2}{5}x-x=\dfrac{3}{4}+\dfrac{1}{8}\)

\(\Rightarrow\left(\dfrac{2}{5}-1\right)x=\dfrac{7}{8}\)

\(\Rightarrow\dfrac{-3}{5}x=\dfrac{7}{8}\)

\(\Rightarrow x=\dfrac{7}{8}.\dfrac{-5}{3}\)

\(\Rightarrow x=\dfrac{-35}{24}\)