a) \(x-\dfrac{5}{6}=\dfrac{1}{2}\)

           \(x=\dfrac{1}{2}+\dfrac{5}{6}\)

           \(x=\dfrac{4}{3}\)

vậy x = ....

b) \(3\dfrac{1}{3}x+16\dfrac{3}{4}=-13,25\)

    \(\dfrac{10}{3}\)\(x+\dfrac{67}{4}=-13,25\)

     \(\dfrac{10}{3}x=\left(-13,25\right)-\dfrac{67}{4}\)

      \(\dfrac{10}{3}x=-30\)

          \(x=\left(-30\right):\dfrac{10}{3}\)

         \(x=-9\)

vậy x =...

sai mog bn thông cảm!!!

\(3\frac{1}{3}x+16\frac{3}{4}=-13,25\)

\(\Leftrightarrow\frac{3\times3+1}{3}x+\frac{16\times4+3}{4}=-13,25\)

\(\Leftrightarrow\frac{9+1}{3}x+\frac{64+3}{4}=-13,25\)

\(\Leftrightarrow\frac{10}{3}x+\frac{67}{4}=-13,25\)

\(\Leftrightarrow\frac{10}{3}x+16,75=-13,25\)

\(\Leftrightarrow\frac{10}{3}x=-13,25-16,75\)

\(\Leftrightarrow\frac{10}{3}x=-30\)

\(\Leftrightarrow x=-30\div\frac{10}{3}\)

\(\Leftrightarrow x=\frac{-30}{1}\times\frac{3}{10}\)

\(\Leftrightarrow x=\frac{-90}{10}\)

\(\Leftrightarrow x=-9\)

\(3\frac{1}{3}x+16\frac{3}{4}=-13,25\)

<=> \(\frac{10}{3}x+\frac{67}{4}=-\frac{53}{4}\)\(\frac{10}{3}x=-\frac{53}{4}-\frac{67}{4}\)=> \(\frac{10}{3}x=-\frac{120}{4}=-30\)

<=> X=(-3)*3  => X=-9

Đáp số: x=-9

\(\frac{10}{3}x+\frac{67}{4}=-\frac{53}{4}\)

<=> \(\frac{10}{3}x=-30\)

=> x = -9

a) (7x - 11)³ = 2⁵ x 5² + 200

     (7x - 11)³ = 800 + 200

     (7x - 11)³ = 1000

     (7x - 11)³ = 10³

=>     7x - 11 = 10

=>            7x = 10 + 11

=>             7x = 21

=>                x =  3

b) \(3\frac{1}{3}x+16\frac{3}{4}=-13,25\)

                     \(3\frac{1}{3}x=-13,25-16\frac{3}{4}\)

                     \(\frac{10}{3}x=-30\)

                             \(x=-9\)

a, x= 3

b, -9

đáp số 

a=3

b=-9

hok tốt

\(3\dfrac{1}{3}x+16\dfrac{3}{4}=-13,25\)

\(\Rightarrow\dfrac{10}{3}x+\dfrac{67}{4}=-\dfrac{53}{4}\)

\(\Rightarrow\dfrac{10}{3}x=-\dfrac{53}{4}-\dfrac{67}{4}\)

\(\Rightarrow\dfrac{10}{3}x=\dfrac{-120}{4}\)

\(\Rightarrow\dfrac{10}{3}x=-30\)

\(\Rightarrow x=-30:\dfrac{10}{3}\)

\(\Rightarrow x=-9\)

Vậy: ...

\(3\dfrac{1}{3}x+16\dfrac{3}{4}=-13,25\)

\(\Leftrightarrow\dfrac{10}{3}x+\dfrac{67}{4}=\dfrac{-53}{4}\)

\(\dfrac{10}{3}x=\dfrac{-53}{4}-\dfrac{67}{4}\)

\(\dfrac{10}{3}x=\dfrac{-120}{4}=-30\)

\(x=-30.\dfrac{3}{10}\)

\(x=\dfrac{-90}{10}=-9\)

\(\dfrac{31}{3}x+16\dfrac{3}{4}=-13,25\)

\(\dfrac{31}{3}x=\dfrac{-53}{4}-\dfrac{67}{4}\)

\(\dfrac{31}{3}x=-30\)

\(\Rightarrow x=-30:\dfrac{31}{3}\)

\(\Rightarrow x=\dfrac{-90}{31}\)

=>10/3x=3,5

=>x=21/20