Question

tìm x

Answer 1

\(\dfrac{11}{12}-\left(\dfrac{2}{5}-2\dfrac{1}{3}x\right)^3=\dfrac{19}{24}\)

\(\Rightarrow\left(\dfrac{2}{5}-\dfrac{7}{3}x\right)^3=\dfrac{11}{12}-\dfrac{19}{24}\)

\(\Rightarrow\left(\dfrac{2}{5}-\dfrac{7}{3}x\right)^3=\dfrac{22}{24}-\dfrac{19}{24}\)

\(\Rightarrow\left(\dfrac{2}{5}-\dfrac{7}{3}x\right)^3=\dfrac{3}{24}=\dfrac{1}{8}\)

\(\Rightarrow\left(\dfrac{2}{5}-\dfrac{7}{3}x\right)^3=\left(\dfrac{1}{2}\right)^3\)

\(\Rightarrow\dfrac{2}{5}-\dfrac{7}{3}x=\dfrac{1}{2}\)

\(\Rightarrow\dfrac{7}{3}x=\dfrac{2}{5}-\dfrac{1}{2}\)

\(\Rightarrow\dfrac{7}{3}x=-\dfrac{1}{10}\)

\(\Rightarrow x=-\dfrac{1}{10}:\dfrac{7}{3}\)

\(\Rightarrow x=-\dfrac{3}{70}\)

Answer 2

siu

Answer 3

=>(2/5-7/3x)^3=11/12-19/24=3/24=1/8

=>2/5-7/3x=1/2

=>7/3x=2/5-1/2=-1/10

=>x=-3/70

Answer 4

`e)11/12-(2/5-2(1)/3x)^3=19/14`

`=>11/12-(2/5-7/3x)^3=19/14`

`=>(2/5-7/3x)^3=3/24`

`=>2/5-7/3x=1/8`

`=>7/3x=-1/10`

`=>x=-3/70`

Answer 5

11 12 − ( 2 5 − 2 1 3 x ) 3 = 19 24 ⇒ ( 2 5 − 7 3 x ) 3 = 11 12 − 19 24 ⇒ ( 2 5 − 7 3 x ) 3 = 22 24 − 19 24 ⇒ ( 2 5 − 7 3 x ) 3 = 3 24 = 1 8 ⇒ ( 2 5 − 7 3 x ) 3 = ( 1 2 ) 3 ⇒ 2 5 − 7 3 x = 1 2 ⇒ 7 3 x = 2 5 − 1 2 ⇒ 7 3 x = − 1 10 ⇒ x = − 1 10 : 7 3 ⇒ x = − 3 70