Question

Tìm x : 
` a) 11/13-(5/21 - x ) = - (1 1/14 - 11/13 )`

`b) | x+ 4/15 | - |-3,75|=-|-2,15|`

Answer 1

`a, 11/13 - 5/21 + x = -15/14 + 11/13`

`x = -15/14 + 5/21`

`x = -5/6`.

`b, |x + 4/15| - 3,75 = -2,15`

`|x + 4/15| = 1,6`

`->` \(\left[{}\begin{matrix}x+\dfrac{4}{5}=1,6\\x+4,5=-1,6\end{matrix}\right.\)

`->` \(\left[{}\begin{matrix}x=0,8\\x=-2,4\end{matrix}\right.\)

Answer 2

a) \(\dfrac{11}{13}-\left(\dfrac{5}{21}-x\right)=-\dfrac{41}{182}\)

\(\dfrac{5}{21}-x=\dfrac{11}{13}-\left(-\dfrac{41}{182}\right)\)

\(\dfrac{5}{21}-x=\dfrac{15}{14}\)

\(x=\dfrac{5}{21}-\dfrac{15}{14}\)

\(x=-\dfrac{5}{6}\)

vậy x =...