7/4 - x . 5/6 = 1/2 + 1/3
7/4 - x . 5/6 = 5/6
7/4 - x = 5/6 : 5/6
7/4 - x = 1
x = 7/4 - 1
x = 3/4

7/4 - x . 5/6 = 1/2 + 1/3
7/4 - x . 5/6 = 5/6
7/4 - x = 5/6 : 5/6
7/4 - x = 1
x = 7/4 - 1
x = 3/4

7-4-Xx5/6 = 5/6

        x5/6 = 7/4 - 5/6 

        x5/6 =  11/12

        x     =    11/12 : 5/6 

        x     =    11/10

cho mình hỏi có phải là 7/4  - nhân x nhân 5/6 = 1/2 = 1/3 

đúng k

\(\frac{7}{4}\)-X x \(\frac{5}{6}\)=\(\frac{3}{6}\)+ \(\frac{2}{6}\)

\(\frac{7}{4}\)-X x \(\frac{5}{6}\)=\(\frac{5}{6}\)

\(\frac{7}{4}\)- X  = \(\frac{5}{6}\):\(\frac{5}{6}\)

\(\frac{7}{4}\)- X =1

X=\(\frac{7}{4}\)-1

X=\(\frac{3}{4}\)

tk nhé@@@@@@@@@@@@

\(\frac{1}{3}+x\times\frac{5}{6}-\frac{1}{6}=\frac{2}{3}\)

\(\Rightarrow x\times\frac{5}{6}-\frac{1}{6}=\frac{2}{3}-\frac{1}{3}=\frac{1}{3}\)

\(\Rightarrow x\times\frac{5}{6}=\frac{2}{6}+\frac{1}{6}=\frac{1}{2}\)

\(\Rightarrow x=\frac{1}{2}\times\frac{6}{5}=\frac{3}{5}\)

tk : aichoichuberong

mk : rongbechuchoiai

\(\frac{1}{3}+\frac{x\times5}{6}-\frac{1}{6}=\frac{2}{3}\)

\(\Rightarrow\frac{x\times5}{6}=\frac{2}{3}-\frac{1}{3}-\frac{1}{6}\)

\(\Rightarrow\frac{x\times5}{6}=\frac{1}{3}-\frac{1}{6}=\frac{1}{6}\)

\(\Rightarrow\frac{x\times5}{6}=\frac{1}{6}\)

\(\Rightarrow x\times5=1\)

\(\Rightarrow x=\frac{1}{5}\)

+) \(x=\dfrac{122}{21}\)

+) \(x=\dfrac{7}{9}\)

+) \(x=5\)

Lời giải:

a. 

$x-\frac{1}{2}=\frac{2}{3}$

$x=\frac{2}{3}+\frac{1}{2}=\frac{7}{6}$

b. 

$x\times \frac{5}{6}=\frac{1}{2}$
$x=\frac{1}{2}: \frac{5}{6}=\frac{3}{5}$

c.

$x:\frac{2}{5}=10$

$x=10\times \frac{2}{5}=4$

d.

$\frac{7}{5}-x=\frac{12}{10}$

$x=\frac{7}{5}-\frac{12}{10}=\frac{1}{5}$

lỗi

xin lỗi lúc đó tớ ko thấy câu hỏi

   \(\dfrac{2}{5}+\dfrac{2}{3}+\dfrac{2}{4}\)

= \(\dfrac{24}{60}\) + \(\dfrac{40}{60}\) + \(\dfrac{30}{60}\)

= \(\dfrac{64}{60}\) + \(\dfrac{30}{60}\)

= \(\dfrac{47}{30}\)

\(\dfrac{2}{6}+\dfrac{3}{12}\)

= \(\dfrac{4}{12}\) + \(\dfrac{3}{12}\)

= \(\dfrac{7}{12}\)

\(\dfrac{5}{6}\) + \(\dfrac{1}{3}\)

= \(\dfrac{5}{6}\) + \(\dfrac{2}{6}\)

= \(\dfrac{7}{6}\)

   \(\dfrac{1}{3}\) + \(\dfrac{5}{12}\) + \(\dfrac{5}{6}\)

= \(\dfrac{4}{12}\) + \(\dfrac{5}{12}\) + \(\dfrac{10}{12}\)

= \(\dfrac{9}{12}\) + \(\dfrac{10}{12}\)

= \(\dfrac{19}{12}\)

    \(\dfrac{5}{8}\) + \(\dfrac{4}{7}\)

= \(\dfrac{35}{56}\) + \(\dfrac{32}{56}\)

=  \(\dfrac{67}{56}\) 

\(\dfrac{7}{3}\) + \(\dfrac{8}{7}\)

= \(\dfrac{49}{21}\) + \(\dfrac{24}{21}\)

= \(\dfrac{73}{21}\)

   \(\dfrac{1}{5}+\dfrac{5}{35}\)

= \(\dfrac{7}{35}\) + \(\dfrac{5}{35}\)

= \(\dfrac{12}{35}\) 

Lời giải chi tiết: