`(2x-4,5):3/4-1/3=1`

`=>(2x-4,5):3/4=1+1/3`

`=>(2x-4,5):3/4=3/3+1/3`

`=>(2x-4,5):3/4=4/3`

`=>2x-4,5=4/3xx3/4`

`=>2x-4,5=1`

`=>2x=1+4,5`

`=>2x=5,5`

`=>x=2,75`

$(2x-4,5):3/4-1/3=1$

$=>(2x-4,5):3/4=1+1/3$

$=>(2x-4,5):3/4=3/3+1/3$

$=>(2x-4,5):3/4=4/3$

$=>2x-4,5=4/3xx3/4$

$=>2x-4,5=1$

$=>2x=1+4,5$

$=>2x=5,5$

$=>x=2,75$

tao là N nè kqua phần a ra 20/3, phần b là 2.5 còn phần c tao làm rồi nhưng không chắc

tao làm xog rồi

a=5/2

b=5

c=2

b) x = 1,75

câu a bạn chưa ghi x

cậu làm ơn ghi rõ lời giải ra đi

để tớ viết lại câu a

7,5 . 1 3/4=6 2/5

d: =>-x-5/6=7/12-4/12=3/12=1/4

=>-x=1/4+5/6=13/12

hay x=-13/12

e: =>x+3=-5

hay x=-8

f: =>4,5-2x=-1/2

=>2x=5

hay x=5/2

a: Ta có: \(\left|\dfrac{2}{5}-x\right|+\dfrac{1}{2}=3.5\)

\(\Leftrightarrow\left|x-\dfrac{2}{5}\right|=3\)

\(\Leftrightarrow\left[{}\begin{matrix}x-\dfrac{2}{5}=3\\x-\dfrac{2}{5}=-3\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}x=\dfrac{17}{5}\\x=-\dfrac{13}{5}\end{matrix}\right.\)

b: Ta có: \(\dfrac{21}{5}+3:\left|\dfrac{x}{4}-\dfrac{2}{3}\right|=6\)

\(\Leftrightarrow3:\left|\dfrac{1}{4}x-\dfrac{2}{3}\right|=6-\dfrac{21}{5}=\dfrac{9}{5}\)

\(\Leftrightarrow\left|\dfrac{1}{4}x-\dfrac{2}{3}\right|=\dfrac{5}{3}\)

\(\Leftrightarrow\left[{}\begin{matrix}\dfrac{1}{4}x-\dfrac{2}{3}=\dfrac{5}{3}\\\dfrac{1}{4}x-\dfrac{2}{3}=-\dfrac{5}{3}\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}\dfrac{1}{4}x=\dfrac{7}{3}\\\dfrac{1}{4}x=-1\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}x=\dfrac{28}{3}\\x=-4\end{matrix}\right.\)