Question

Tìm X:

1,2x (\(\dfrac{2,4xX-0,21}{X}\) - 0,5) = 1,44

Answer 1

`1,2xx([2,4xx x-0,21]/x-0,5)=1,44`

`[2,4xx x-0,21]/x-0,5=1,44:1,2=1,2`

`[2,4xx x-0,21]/x=1,2+0,5=1,7`

`2,4xx x-0,21=1,7xx x`

`2,4xx x-1,7xx x=0,21`

`(2,4-1,7)xx x=0,21`

`0,7xx x=0,21`

`x=0,21:0,7=0,3`

Answer 2

`=> (2,4 xx x - 0,21)/x - 1/2 = 1,2`

`=> (2,4 xx x - 0,21)/x = 1,7`

`=> 2,4 xx x - 0,21 = 1,7x`

`=> 0,7 xx x = 0,21`

`=> x = 0,3`

Answer 3

\(1,2\times\left(\dfrac{2,4\times x-0,21}{x}-0,5\right)=1,44\\ \dfrac{2,4x-0,21}{x}-0,5=1,44:1,2=1,2\\ \dfrac{2,4x-0,21}{x}=1,2+0,5=1,7\\ 2,4x-0,21=1,7x\\ 2,4x-1,7x=0,21\\ 0,7x=0,21\\ x=0,21:0,7=0,3\)

Answer 4

<=>

\(\dfrac{6}{5}\times\left(\dfrac{2,4x-0,21}{x}-\dfrac{1}{2}\right)=1,44\)

=>

\(\dfrac{2,4x-0,21}{x}=1,44:\dfrac{6}{5}+\dfrac{1}{2}=\dfrac{17}{10}\)

<=>

\(17x=10\left(2,4x-0,21\right)\)

<=>

\(17x=24x-\dfrac{21}{10}\)

<=>

17x - 24x + 21/10 = 0

<=>

-7x = -21/10

=> x = -21/10 : -7 = 3/10

Answer 5

\(=>\dfrac{1,2x2,4xX-1,2x0,5}{X}=1,44\\ < =>2,88xX-0,6=1,44xX\\ < =>2,88xX-1,44xX=0,6\\ < =>1,44xX=0,6\\ < =>X=0,6:1,44=\dfrac{5}{12}\)