\(\Leftrightarrow\dfrac{x}{5}=\dfrac{1}{5}\\ \Leftrightarrow x=\dfrac{5.1}{5}=\dfrac{5}{5}=1\)

x/5=5/6-19/30

x/5=25/30-19/30

x/5=1/5

x=1

x/5 = 5/6 + (-19/30)

<=> x/5 = 1/5

<=> x . 5 = 5

<=> x = 5 : 5

<=> x = 1

Vậy.....

\(\frac{5}{6}+\frac{\left(-19\right)}{30}=\frac{x}{5}\)

\(\frac{25}{30}+\frac{\left(-19\right)}{30}=\frac{x}{5}\)

\(\frac{6}{30}=\frac{x}{5}\)

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

\(\Rightarrow5x=5\times1\)

\(5x=5\)

\(x=5\div5\)

\(x=1\)

\(\frac{5}{6}+\frac{-19}{30}=\frac{x}{5}\)

\(\Leftrightarrow\frac{x}{5}=\frac{5}{6}+\frac{-19}{30}\)

\(\Leftrightarrow\frac{x}{5}=\frac{25}{30}+\frac{-19}{30}\)

\(\Leftrightarrow\frac{x}{5}=\frac{6}{30}\)

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

\(\Rightarrow x=1\)

Vậy \(x=1\)

x/5    = 5/6 + -19/ 30

=> x/5      =      25/30 + -19/30

=> x/5      =    6/30

=> x/5      =    1/5

=>   x       =     1 ( vì mẫu số = 5 )

Vậy x = 1 

Chúc bạn học giỏi !!!

\(\frac{x}{5}=\frac{5}{6}+-\frac{19}{30}\)

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

\(\Rightarrow x=1\)

học tốt ~~~~

\(\frac{x}{5}=\frac{5}{6}+\frac{-19}{30}\)

\(\Rightarrow\frac{x}{5}=\frac{25-19}{30}\)

\(\Rightarrow\frac{x}{5}=\frac{6}{30}\)

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

\(\Rightarrow x=1\)

x = 5/6 + (-19)/30

x = 25/30 + (-19)/30

x = 6/30

x = 1/5 (t/m)

Kết luận:....

Chúc bạn học tốt, nhớ nha.

x = 5/6 + (-19)/30

   = 25/30 + (-19)/30

.  = 4/30

Nhớ k cho mình nha

a, x= \(\dfrac{1}{4}\)

b, x= \(\dfrac{1}{5}\)

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

6x/30=25/30+-19/30                       6x/30=6/30            6x=6          x=1

lớp mấy đấy bạn

chi pa pi mô nha nhô

a) \(\dfrac{x}{3}=\dfrac{2}{3}+\dfrac{-1}{7}\)

\(\Rightarrow\dfrac{x}{3}=\dfrac{11}{21}\)

\(\Rightarrow x=\dfrac{3\cdot11}{21}\)

\(\Rightarrow x=\dfrac{33}{21}\)

\(\Rightarrow x=\dfrac{11}{7}\)

b) \(\dfrac{x}{5}=\dfrac{5}{6}+\dfrac{-19}{30}\)

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

\(\Rightarrow x=\dfrac{5\cdot1}{5}\)

\(\Rightarrow x=1\)

\(\left(\frac{17}{28}+18.29+\frac{19}{30}+\frac{30}{31}\right).\left(\frac{-5}{12}+\frac{1}{4}+\frac{1}{6}\right)\)

\(=\left(\frac{17}{28}+18.29+\frac{19}{30}+\frac{30}{31}\right).\left(\frac{-5}{12}+\frac{3}{12}+\frac{2}{12}\right)\)

\(=\left(\frac{17}{28}+18.29+\frac{19}{30}+\frac{30}{31}\right).\left(\frac{-2}{12}+\frac{2}{12}\right)\)

\(=\left(\frac{17}{28}+18.29+\frac{19}{30}+\frac{30}{31}\right).0\)

\(=0\)

giúp