\(\frac{7}{6}+\frac{5}{6}:5-\frac{3}{8}.\left(-3\right)^2\)

\(=\frac{7}{6}+\frac{5}{6}.\frac{1}{5}-\frac{3}{8}.9\)

\(=\frac{7}{6}+\frac{1}{6}-\frac{27}{8}\)

\(=\frac{8}{6}-\frac{27}{8}\)

\(=\frac{32}{24}-\frac{81}{24}\)

\(=\frac{-49}{24}\)

Chúc bạn học tốt !!! 

\(\left(\frac{3}{5}-\frac{2}{3}x\right)^3=\left(\frac{-4}{5}\right)^3\)

\(\frac{3}{5}-\frac{2}{3}x=\frac{-4}{5}\)

\(\frac{2}{3}x=\frac{7}{5}\)

\(x=\frac{21}{10}\)

\(\left(\frac{3}{5}-\frac{2}{3}.x\right)^3=\frac{-64}{125}\)

\(\Leftrightarrow\left(\frac{3}{5}-\frac{2}{3}.x\right)^3=\left(-\frac{4}{5}\right)^3\)

\(\Rightarrow\frac{3}{5}-\frac{2}{3}.x=-\frac{4}{5}\)

\(\Leftrightarrow\frac{2}{3}.x=\frac{3}{5}-\left(-\frac{4}{5}\right)\)

\(\Leftrightarrow\frac{2}{3}.x=\frac{3}{5}+\frac{4}{5}\)

\(\Leftrightarrow\frac{2}{3}.x=\frac{7}{5}\)

\(\Leftrightarrow x=\frac{7}{5}:\frac{2}{3}\)

\(\Leftrightarrow x=\frac{21}{10}\)

Vậy \(x=\frac{21}{10}\)

\(\left(\frac{3}{5}-\frac{2}{3}x\right)^3=\frac{-64}{125}\)

\(\left(\frac{3}{5}-\frac{2}{3}x\right)^3=\left(\frac{-4}{5}\right)^3\)

\(\frac{3}{5}-\frac{2}{3}x=\frac{-4}{5}\)

\(\frac{9}{15}-\frac{10x}{15}=\frac{-12}{15}\)

\(-\frac{10x}{15}=\frac{9}{15}-\frac{-12}{15}\)
\(\text{ }-10x=9+12\)

\(-10x=21\)

\(x=\frac{-21}{10}\)

k nha

\(\frac{3}{4.7}=\frac{1}{4}-\frac{1}{7}\); \(\frac{1}{7.8}=\frac{1}{7}-\frac{1}{8}\); \(\frac{5}{8.13}=\frac{1}{8}-\frac{1}{13}\); \(\frac{2}{13.15}=\frac{1}{13}-\frac{1}{15}\); \(\frac{9}{15.24}=\frac{1}{15}-\frac{1}{24}\)

nên ta được tổng trên là : \(\frac{1}{4}-\frac{1}{7}\)\(+\frac{1}{7}-\frac{1}{8}\)\(+\frac{1}{8}-\frac{1}{13}\)\(+\frac{1}{13}-\frac{1}{15}\)\(+\frac{1}{15}-\frac{1}{24}\)= \(\frac{1}{4}-\frac{1}{24}\)= 5/24

Nấu bạn k cho mình lên 3 điểm hỏi đáp thì mình sẽ giúp

cảm ơn bạn nha

5/8 + 0,2 : |-x/4 + 2/5| = 3/2

         0,2 : |-x/4 + 2/5| = 3/2 - 5/8 

         0,2 : |-x/4 + 2/5| = 7/8

                 |-x/4 + 2/5| = 7/8 . 0,2

                 |-x/4 + 2/5| = 7/40

\(\Rightarrow\orbr{\begin{cases}-\frac{x}{4}+\frac{2}{5}=\frac{7}{40}\\-\frac{x}{4}+\frac{2}{5}=-\frac{7}{40}\end{cases}\Rightarrow\orbr{\begin{cases}-\frac{x}{4}=-\frac{9}{40}\\-\frac{x}{4}=-\frac{23}{40}\end{cases}\Rightarrow}\orbr{\begin{cases}x=\frac{9}{10}\\x=\frac{23}{10}\end{cases}}}\)

 Báo cáo sai phạm

5/8 + 0,2 : |-x/4 + 2/5| = 3/2

         0,2 : |-x/4 + 2/5| = 3/2 - 5/8 

         0,2 : |-x/4 + 2/5| = 7/8

                 |-x/4 + 2/5| = 7/8 . 0,2

                 |-x/4 + 2/5| = 7/40

⇒[

⇒[

⇒[

\(\frac{5}{8}+0,2:\left|\frac{-x}{4}+\frac{2}{5}\right|=\frac{3}{2}\)

\(\Leftrightarrow\frac{33}{40}:\left|\frac{-x}{4}+\frac{2}{5}\right|=\frac{3}{2}\)

\(\Leftrightarrow\left|\frac{-x}{4}+\frac{2}{5}\right|=\frac{33}{40}:\frac{3}{2}\)

\(\Leftrightarrow\left|\frac{-x}{4}+\frac{2}{5}\right|=\frac{11}{20}\)

\(\Leftrightarrow\hept{\begin{cases}\Leftrightarrow\frac{-x}{4}+\frac{2}{5}=-\frac{11}{20}\\\Leftrightarrow\frac{-x}{4}+\frac{2}{5}=\frac{11}{20}\end{cases}}\Leftrightarrow\hept{\begin{cases}-\frac{x}{4}=\frac{-19}{20}\\\frac{-x}{4}=\frac{3}{20}\end{cases}\Leftrightarrow}\hept{\begin{cases}-x=-3,8\\-x=0,6\end{cases}}\Leftrightarrow\hept{\begin{cases}x=3,8\\x=-0,6\end{cases}}\)

Vậy :  \(x=3,8\) hoặc \(x=-0,6\)

-4,43. 1,2 + 0,87. (-6/5 ) + ( -3,3 ) : 5/6 = -6.47

\(\left|-\frac{2}{5}x-\frac{4}{3}\right|=\left|4x-\frac{5}{6}\right|\)

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

\(=-\frac{2x}{5}-\frac{4}{3}=-\left(4x-\frac{5}{6}\right)\)

\(=x=-\frac{5}{44};\frac{65}{108}\)

\(\Rightarrow x=\orbr{\begin{cases}x=-\frac{5}{44}\\x=\frac{65}{108}\end{cases}}\)

|−25 x−43 |=|4x−56 |

=−2x5 −43 =4x−56 

=−2x5 −43 =−(4x−56 )

=x=−544 ;65108 

⇒x=[

mình thiếu dấu gạch p/s sorry

\(\frac{5}{21}\)+ \(0,5\) - \(\frac{19}{23}+\frac{16}{21}-\frac{4}{23}\)= 0,5

Chúc học tốt!!!

bạn ghi rõ được ko

=(\(\frac{5}{21}\)+\(\frac{16}{21}\))-( \(\frac{19}{23}\)+\(\frac{4}{23}\)) + 0,5

=1-1+0,5

=0,5

\(5\times95+5\times4+5\)

\(=5\times\left(95+4+1\right)\)

\(=5\times100\)

\(=500\)

5 x 95 + 5 x 4 + 5

= 5 x ( 95 + 4 + 1 )

= 5 x 100

= 500

5 x 95 + 5 x 4 + 5

= 5 x ( 95 + 4 + 1 )

= 5 x 100

= 500