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26 tháng 3 2018

\(x-2.5=\frac{1}{3}+\frac{2x}{3}\)

\(\Leftrightarrow\frac{3\left(x-2,5\right)}{3}=\frac{2x+1}{3}\)

\(\Leftrightarrow3x-7,5=2x+1\)

\(\Leftrightarrow x=8,5\)

26 tháng 3 2018

\(x-2,5=\frac{1}{3}+\frac{2}{3}x\)

\(x-\frac{2}{3}x=\frac{1}{3}+2,5\)

\(\frac{1}{3}x=\frac{1}{3}+\frac{5}{2}\)

\(\frac{1}{3}x=\frac{17}{6}\)

\(x=\frac{17}{2}\)

8 tháng 9 2021

a)4/3:x=-4/7                         b)5/3.x=7/12

⇒x=-16/21                             ⇒x=7/20

8 tháng 9 2021

a. \(\dfrac{5}{7}+\dfrac{4}{3}:x=\dfrac{1}{7}\)

<=> \(\dfrac{5}{7}+\dfrac{4}{3}.\dfrac{1}{x}=\dfrac{1}{7}\)

<=> \(\dfrac{5}{7}+\dfrac{4}{3x}=\dfrac{1}{7}\)         ĐKXĐ: x \(\ne\) 0

<=> \(\dfrac{15x}{21x}+\dfrac{28}{21x}=\dfrac{3x}{21x}\)

<=> 15x + 28 = 3x

<=> 15x - 3x = -28

<=> 12x = -28

<=> x = \(\dfrac{-28}{12}=-\dfrac{7}{3}\)

b. \(\dfrac{5}{3}x.\dfrac{-1}{4}=\dfrac{2}{6}\)

<=> \(\dfrac{-5x}{12}=\dfrac{2}{6}\)

<=> -5x . 6 = 12 . 2

<=> -30x = 24

<=> x = \(-\dfrac{4}{5}\)

`@` `\text {Ans}`

`\downarrow`

\(\dfrac{2}{3}\times x-\dfrac{x}{2}-\dfrac{1}{2}=\dfrac{1}{4}?\)

`=>`\(\dfrac{2}{3}x-\dfrac{x}{2}-\dfrac{1}{2}=\dfrac{1}{4}\)

`=>`\(\dfrac{4x}{6}-\dfrac{3x}{6}-\dfrac{1}{2}=\dfrac{1}{4}\)

`=>`\(\dfrac{x}{6}-\dfrac{1}{2}=\dfrac{1}{4}\)

`=>`\(\dfrac{x}{6}=\dfrac{1}{4}+\dfrac{1}{2}\)

`=>`\(\dfrac{x}{6}=\dfrac{3}{4}\)

`=> 4x=3*6`

`=> 4x=18`

`=> x=`\(\dfrac{18}{4}=\dfrac{9}{2}=4,5\)

Vậy, `x=4,5.`

\(\href{https://hoc24.vn/vip/14874167551162}{\text{_KaizulvG_}}\)

xin sua cho tôi học giỏi toán nhe

5-2/3x:1/7=23/6

2/3x:1/7=5-23/6

2/3x*7=7/6

2/3x=7/6:7

2/3x=1/6

den day la dung roi

2/3x=2/12=1/6 (vut phan gach ngang di)

Con 3x=12=>x=4

D/S:x=4

 

 

3 tháng 7 2015

5-2/3x:1/7=23/6

2/3x:1/7=5-23/6

2/3x*7=7/6

2/3x=7/6:7

2/3x=1/6

x=1/6:2/3

x=1/4

9 tháng 5 2017

A.\(\left(\frac{4}{7}.x-1\right).3=\frac{1}{21}\)

\(\frac{4}{7}.x-1=\frac{1}{21}:3\)

\(\frac{4}{7}.x-1=\frac{1}{21}.3\)

\(\frac{4}{7}.x-1=\frac{1}{7}\)

\(\frac{4}{7}.x=1+\frac{1}{7}\)

\(\frac{4}{7}.x=\frac{8}{7}\)

\(x=\frac{8}{7}:\frac{4}{7}\)

\(x=\frac{8}{7}.\frac{7}{4}\)

\(x=2\)

Vậy x=2

C.\(\frac{2}{3}.x-\frac{1}{3}.x=\frac{5}{9}\)

\(\left(\frac{2}{3}-\frac{1}{3}\right).x=\frac{5}{9}\)

\(\frac{1}{3}.x=\frac{5}{9}\)

\(x=\frac{5}{9}:\frac{1}{3}\)

\(x=\frac{5}{9}.3\)

\(x=\frac{5}{3}\)

Vậy \(x=\frac{5}{3}\)

D. \(\left(x-2\frac{1}{4}\right).\left(\frac{-2}{3}\right).50\%=2\frac{5}{6}\)

\(x.\frac{-2}{3}-\frac{9}{4}.\frac{-2}{3}=\frac{17}{6}:\frac{1}{2}\)

\(x.\frac{-2}{3}-\frac{-3}{2}=\frac{17}{6}.2\)

\(x.\frac{-2}{3}+\frac{3}{2}=\frac{17}{3}\)

\(x.\frac{-2}{3}=\frac{17}{3}-\frac{3}{2}\)

\(x.\frac{-2}{3}=\frac{34}{6}-\frac{9}{6}\)

\(x.\frac{-2}{3}=\frac{25}{6}\)

\(x=\frac{25}{6}:\frac{-2}{3}\)

\(x=\frac{25}{6}.\frac{3}{-2}\)

\(x=\frac{25}{-4}\)

Vậy \(x=\frac{25}{-4}\)

1/2 * x + 2/3 * x = x + 4

x * (1/2+2/3) = x + 4

7/6 * x = x + 4

7/6 * x - x = 4

1/6 * x = 4

x =  24

6 tháng 5 2017

50%.x+2/3.x=x+4

=>1/2.x+2/3.x=x+4

(1/2+2/3).x=x+4

7/6.x=x+4

x+4:x=7/6

ae cầu cứu tau làm saI RỒI @@