`( 4/5 : 6/5 + 1/5 : 1/x ) xx 30 = 26 = 54`

Hai dấu `=` là sao nhỉ ?

x ở đâu thế bạn

\(\Leftrightarrow\)\(\left(\frac{2}{3}+\frac{x}{5}\right)\)\(\times30-26=54\)

\(\Leftrightarrow20+6x\)\(-26=54\)

\(\Leftrightarrow6x=54+26-20\)

\(\Leftrightarrow6x=60\)

\(\Leftrightarrow x=10\)

Học tốt!

\(\left(\frac{4}{5}:\frac{6}{5}+\frac{1}{5}:\frac{1}{x}\right)\cdot30-26=54\)

\(\left(\frac{4}{5}\cdot\frac{5}{6}+\frac{1}{5}\cdot x\right)\cdot30=54+26\)

\(\left(\frac{2}{3}+\frac{x}{5}\right)\cdot30=80\)

\(\frac{2}{3}+\frac{x}{5}=80:30\)

\(\frac{2}{3}+\frac{x}{5}=\frac{8}{3}\)

\(\frac{x}{5}=\frac{8}{3}-\frac{2}{3}\)

\(\frac{x}{5}=2\)

\(x=10\)

\(x=10\)\(nha\) 

\(HOK\)\(T~\)

\(\left(\frac{4}{5}:\frac{6}{5}+\frac{1}{5}:\frac{1}{x}\right)\cdot30-26=54\)

\(\left(\frac{2}{3}+\frac{x}{5}\right)\cdot30=54\cdot26\)

\(\left(\frac{2}{3}+\frac{x}{5}\right)\cdot30=1404\)

\(\frac{2}{3}+\frac{x}{5}=1404:30\)

\(\frac{2}{3}+\frac{x}{5}=\frac{234}{5}\)

\(\frac{x}{5}=\frac{234}{5}-\frac{2}{3}\)

\(\frac{x}{5}=\frac{692}{15}\)

\(x=\frac{692}{15}\cdot5\)

\(x=\frac{692}{3}\)

\(\left(\frac{4}{5}:\frac{6}{5}+\frac{1}{5}:\frac{1}{x}\right)\times30-26=54\)

\(\Leftrightarrow\left(\frac{4}{5}\times\frac{5}{6}+\frac{1}{5}\times x\right)\times30=80\)

\(\Leftrightarrow\frac{2}{3}+\frac{1}{5}\times x=\frac{8}{3}\)

\(\Leftrightarrow\frac{1}{5}\times x=2\)

\(\Leftrightarrow x=2:\frac{1}{5}\)

\(\Leftrightarrow x=2\times5\)

\(\Leftrightarrow x=10\)

Vậy x = 10. 

Matcha

\(\left(\frac{4}{5}\div\frac{6}{5}+\frac{1}{5}\div\frac{1}{x}\right)\times30-26=54\)

\(\Leftrightarrow\left(\frac{4}{5}\times\frac{5}{6}+\frac{1}{5}\times\frac{x}{1}\right)\times30=80\)

\(\Leftrightarrow\frac{2}{3}+\frac{x}{5}=\frac{8}{3}\)

\(\Leftrightarrow\frac{x}{5}=2\)

\(\Leftrightarrow x=10\)

Vậy\(x=10\)

\(\Leftrightarrow\left(\dfrac{2}{3}+\dfrac{x}{5}\right)\cdot30=80\)

=>1/5x+2/3=8/3

=>1/5x=2

hay x=10