a) \(\frac{2}{5}+\frac{3}{5}.\left(3x-3,7\right)=\frac{-53}{10}\)

=> \(\frac{3}{5}.\left(3x-3,7\right)=\frac{-53}{10}-\frac{2}{5}\)

=> \(\frac{3}{5}.\left(3x-3,7\right)=\frac{-57}{10}\)

=> \(\left(3x-3,7\right)=\frac{-19}{5}\)

=>\(3x=\frac{-19}{5}+\frac{37}{10}\)

=>\(3x=\frac{-1}{10}\)

=>\(x=\frac{-1}{30}\)

Ko biết đúng hay sai!!?

x = 5/6

7/9 : ( 2 + 3/4 x) + 5/9 = 23/27 

7/9 : ( 2 + 3/4 x) = 23/27 - 5/9 = 8/27

2 + 3/4 x= 7/9 : 8/27 = 21/8

3/4x = 21/8 - 2 = 5/8 

=> x = 5/8 : 3/4 = 5/6 

=)7/9:(2+3/4x)=8/27

=)2+3/4x=21/8

=)3/4x=5/8

=)x=5/6

\(\frac{7}{9}:\left(1+\frac{3}{4}x\right)+\frac{5}{9}=\frac{23}{27}\)

\(\frac{7}{9}:\left(1+\frac{3}{4}x\right)=\frac{8}{27}\)

\(\left(1+\frac{3}{4}x\right)=\frac{21}{8}\)

\(\frac{3}{4}x=\frac{13}{8}\)

\(x=\frac{13}{8}:\frac{3}{4}\)

\(x=\frac{13}{6}\)

Vậy \(x=\frac{13}{6}\)

\(\frac{7}{9}:\left(2+\frac{3}{4}x\right)+\frac{5}{9}=\frac{23}{27}\)

\(\frac{7}{9}:\left(2+\frac{3}{4}x\right)=\frac{23}{27}-\frac{5}{9}\)

\(2+\frac{3}{4}x=\frac{7}{9}:\frac{8}{27}=\frac{21}{8}\)

\(\frac{3}{4}x=\frac{21}{8}-2=\frac{5}{8}\)

\(x=\frac{5}{8}:\frac{3}{4}=\frac{5}{6}\)

Vậy x=5/6

Lấy máy tính bấm là đc mà bn

a) \(x=-\frac{1}{2}\)

b) \(x=-\frac{29}{15}\)

c) \(x=\frac{5}{6}\)

**** cho mình nhé

a) -1/2

b) -29/15

c) 5/6

****

7/9:(2+3/4x)=23/27-5/9

7/9:(2+3/4x)=8/27

      2+3/4x=7/9:8/27

      2+3/4x=21/8

          3/4x=21/8-2

          3/4x=5/8

              x=5/8:3/4

              x=5/6

\(\frac{7}{9}:\left(2+\frac{3}{4}x\right)+\frac{5}{9}=\frac{23}{27}\)

\(\Rightarrow\left(2+\frac{3}{4}x\right)+\frac{5}{9}=\frac{7}{9}:\frac{23}{27}=\frac{21}{23}\)

\(\Rightarrow2+\frac{3}{4}x=\frac{21}{23}-\frac{5}{9}=\frac{74}{207}\)

\(\Rightarrow\frac{3}{4}x=2-\frac{74}{207}=\frac{340}{207}\)

\(\Rightarrow x=\frac{340}{207}:\frac{3}{4}\)

\(\Rightarrow x=\frac{1360}{621}\)

Sr nãy nhầm >:(

\(\frac{7}{9}:\left(2+\frac{3}{4}x\right)+\frac{5}{9}=\frac{23}{27}\)

\(\Rightarrow\frac{7}{9}:\left(2+\frac{3}{4}x\right)=\frac{23}{27}-\frac{5}{9}=\frac{8}{27}\)

\(\Rightarrow2+\frac{3}{4}x=\frac{7}{9}:\frac{8}{27}=\frac{21}{8}\)

\(\Rightarrow\frac{3}{4}x=\frac{21}{8}-2=\frac{5}{8}\)

\(\Rightarrow x=\frac{5}{8}:\frac{3}{4}\)

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

a,x.3\(\dfrac{1}{4}\)+(\(\dfrac{-7}{6}\)).x-1\(\dfrac{2}{3}\)=\(\dfrac{5}{12}\)

\(\Leftrightarrow\)\(\dfrac{13}{4}\)x+(\(\dfrac{-7}{6}\))x-\(\dfrac{5}{3}\)=\(\dfrac{5}{12}\)

\(\Leftrightarrow\)\(\dfrac{13}{4}\)x+(\(\dfrac{-7}{6}\))x=\(\dfrac{25}{12}\)

\(\Leftrightarrow\)\(\dfrac{25}{12}\)x=\(\dfrac{25}{12}\)

\(\Leftrightarrow\)x=1

Vậy x=1

b,\(\dfrac{2}{5}\)+\(\dfrac{3}{5}\).(3x-3,7)=\(\dfrac{-53}{10}\)

\(\Leftrightarrow\)\(\dfrac{3}{5}\).(3x-3,7)=\(\dfrac{-53}{10}\)-\(\dfrac{2}{5}\)

\(\Leftrightarrow\)\(\dfrac{9}{5}\)x-\(\dfrac{111}{50}\)=\(\dfrac{-57}{10}\)

\(\Leftrightarrow\)\(\dfrac{9}{5}\)x=\(\dfrac{-87}{25}\)

\(\Leftrightarrow\)x=\(\dfrac{-29}{15}\)

Vậy x=\(\dfrac{-29}{15}\)

c,\(\dfrac{7}{9}\):(2+\(\dfrac{3}{4}\)x)+\(\dfrac{5}{9}\)=\(\dfrac{23}{27}\)

\(\Leftrightarrow\)\(\dfrac{7}{9}\):(2+\(\dfrac{3}{4}\)x)=\(\dfrac{8}{27}\)

\(\Leftrightarrow\)\(\dfrac{7}{18}\)+\(\dfrac{28}{27}\)x=\(\dfrac{8}{27}\)

\(\Leftrightarrow\)\(\dfrac{28}{27}\)x=\(\dfrac{-5}{54}\)

\(\Leftrightarrow\)x=\(\dfrac{-5}{56}\)

Vậy x=\(\dfrac{-5}{56}\)

Bài 2. > , < ,  = ?

5/7 < 4/3             2/5 < 6/10            1/4 = 3/12                27/36 >

2/9           7/6 > 7/9

7/2 = 2/7        15/23 < 1                  27/9 > 2          14/15 < 1          51/17 < 4

sai rôi

4.x=29/12;-29/12

Câu cuối ban viết rõ lên nhé

\(a,\dfrac{3}{5}+\dfrac{-5}{9}=\dfrac{27-25}{45}=\dfrac{2}{49}.\)

\(c,\dfrac{-27}{23}+\dfrac{5}{21}+\dfrac{4}{23}+\dfrac{16}{21}+\dfrac{1}{2}=\dfrac{-23}{23}+\dfrac{21}{21}+\dfrac{1}{2}=-1+1+\dfrac{1}{2}=\dfrac{1}{2}.\)

\(d,\dfrac{-8}{9}+\dfrac{1}{9}.\dfrac{2}{9}+\dfrac{1}{9}.\dfrac{7}{9}=\dfrac{-8}{9}+\dfrac{1}{9}.\left(\dfrac{2}{9}+\dfrac{7}{9}\right)=\dfrac{-8}{9}+\dfrac{1}{9}.1=\dfrac{-8+1}{9}=\dfrac{-7}{9}.\)