Question

Tìm x, biết:

10-| x-1| =\(\frac{-20}{7}.\frac{7}{-5}\)

Answer 1

10-/x-1/=-20/7. 7/-5

10-/x-1/=-20/7. (-7/5)

10-/x-1/=4

/x-1/=10-4

x-1=6 hoặc x-1=(-6)

x=6+1 hoặc x=-6+1

x=7 hoặc x=-5

Vậy x=7 hoặc x=-5

Answer 2

\(10\left|x-1\right|=\frac{-20}{7}.\frac{7}{-5}\)

\(\Rightarrow10\left|x-1\right|=4\)

\(\Rightarrow\left|x-1\right|=\frac{4}{10}=\frac{2}{5}\)

\(\Rightarrow\left[{}\begin{matrix}x-1=\frac{2}{5}\\x-1=-\frac{2}{5}\end{matrix}\right.\)

\(\Rightarrow\left[{}\begin{matrix}x=\frac{7}{5}\\x=\frac{3}{5}\end{matrix}\right.\)