Question

Tìm x biết :

1. x^2-3/5x=0

2./x-4/5/=1/10

3./x-1/5/-(-1/3)^2=(-2)^3

4.11/3x-1=2.(x+2/11)

Answer 1

1) x\(^2\) - \(\dfrac{3}{5}\) x = 0

(=) x.(x - \(\dfrac{3}{5}\) ) = 0

(=)\(\left[{}\begin{matrix}x=0\\x-\dfrac{3}{5}\left(=\right)x=\dfrac{3}{5}\end{matrix}\right.\)

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

(=)\(\left[{}\begin{matrix}x-\dfrac{1}{5}=\dfrac{1}{10}\\x-\dfrac{1}{5}=\dfrac{-1}{10}\end{matrix}\right.\) (=)\(\left[{}\begin{matrix}x=\dfrac{9}{10}\\x=\dfrac{7}{10}\end{matrix}\right.\)

Answer 2

4) \(\dfrac{11}{3}x-1=2.\left(x+\dfrac{2}{11}\right)\)

(=) \(\dfrac{11}{3}x-1=2x+\dfrac{4}{11}\)

(=) \(\dfrac{11}{3}x-2x=\dfrac{4}{11}+1\)

(=) \(\dfrac{5}{3}x=\dfrac{15}{11}\)

(=) \(x=\dfrac{9}{11}\)