Question

tìm x,biết

 

Answer 1

(x-\(\dfrac{3}{20}\))-\(\dfrac{10}{25}\)=\(-\dfrac{4}{5}\)

(x-\(\dfrac{3}{20}\))-\(\dfrac{2}{5}\)=\(-\dfrac{4}{5}\)

x-\(\dfrac{3}{20}\)=\(-\dfrac{4}{5}\)+\(\dfrac{2}{5}\)

x-\(\dfrac{3}{20}\)=\(\dfrac{-2}{5}\)

x=\(\dfrac{-2}{5}\)+\(\dfrac{3}{20}\)

x=\(\dfrac{-8}{20}\)+\(\dfrac{3}{20}\)

x=\(\dfrac{-5}{20}\)

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

Vậy x=\(\dfrac{-1}{4}\)

 

 

Answer 2

(x - 3/20) - 10/25= -4/5

(x - 3/20) - 2/5    = -4/5

x - 3/20               = -4/5 + 2/5

x - 3/20               = -2/5

x                         = -2/5 + 3/20

x                         = -1/4