\(2,8:\left(\frac{1}{5}-3x\right)=1\frac{2}{5}\)

\(\frac{14}{5}:\left(\frac{1}{5}-3x\right)=\frac{7}{5}\)

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

\(3x=\frac{-9}{10}\)

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

Vậy \(x=\frac{-3}{10}\)

\(2,8:\left(\frac{1}{5}-3x\right)=1\frac{2}{5}\)

\(\frac{1}{5}-3x=\frac{28}{10}:\frac{7}{5}\)

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

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

\(3x=\frac{-9}{5}\)

\(x=\frac{-9}{5}:3\)

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

\(\frac{14}{5}:\left(\frac{1}{5}-3x\right)=\frac{12}{5}\)

\(\Rightarrow\)\(\frac{1}{5}-3x=\frac{7}{6}\)

\(\Rightarrow\)

đg cần gấp

\(2.8:\left(\frac{1}{5}-3x\right)=1\frac{2}{5}\)

\(\frac{14}{5}:\left(\frac{1}{5}-3x\right)=\frac{7}{5}\)

\(\frac{1}{5}-3x=\frac{14}{5}:\frac{7}{5}\)

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

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

\(3x=-\frac{9}{5}\)

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

\(2,8:\left(\frac{1}{5}-3x\right)=1\frac{2}{5}\Rightarrow\frac{14}{5}:\left(\frac{1}{5}-3x\right)=\frac{7}{5}\)

\(\Rightarrow\frac{1}{5}-3x=\frac{14}{5}:\frac{7}{5}\)

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

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

\(\Rightarrow3x=-\frac{9}{5}\)

\(\Rightarrow x=-\frac{9}{5}:3=-\frac{3}{5}\)

Đề bạn tự ghi lại nha, mình chỉ ghi cách trình bày thôi

-6/10*x-7/3=27/5

-6/10*x     =27/5+7/3

-6/10*x     =116/15

x             =116/15:-6/10

x             =116/15*10/-6

x             =-116/9

đề bạn tự ghi lun nha

14/5:(3-3x)=7/5

    3-3x  =14/5:7/5=14/5*5/7=2/1*1/1

    3-3x  =2

       3x  =3-2

       3x  =1

         x  =1:3

 vậy  x   =1/3

\(\Rightarrow\) 1/5-3x = 2/8 : 7/5 = 5/28

\(\Rightarrow\) 3x = 1/5 - 5/28 = 3/140

\(\Rightarrow\) x = 3/140 : 3 = 1/140

2: \(=\dfrac{203}{60}\cdot\dfrac{81}{1225}=\dfrac{783}{3500}\)

a)-12.(8)

b) -0.6

a) \(-0,6x-\dfrac{7}{3}=5,4\Leftrightarrow-\dfrac{3}{5}x=5,4+\dfrac{7}{3}\Leftrightarrow x=\dfrac{116}{15}.\left(-\dfrac{5}{3}\right)=-\dfrac{116}{9}\).

b) \(2,8:\left(\dfrac{1}{5}-3x\right)=1\dfrac{2}{5}\Leftrightarrow\dfrac{1}{5}-3x=2,8:\dfrac{7}{5}\Leftrightarrow-3x=2-\dfrac{1}{5}\Leftrightarrow x=\dfrac{9}{5}:\left(-3\right)=-\dfrac{3}{5}\).

\(2,8:\left(3.x-\frac{5}{8}\right)=2\frac{2}{5}\)

=>\(\frac{14}{5}:\left(3.x-\frac{5}{8}\right)=\frac{12}{5}\)

=>\(\frac{14}{5}:\frac{13}{5}=3.x-\frac{5}{8}\)

=>\(3.x-\frac{5}{8}=\frac{14}{13}\)

=>\(3.x=\frac{14}{13}+\frac{5}{8}\)

=>\(3.x=\frac{177}{104}\)

=>\(x=\frac{59}{104}\)

2,8 :( 3x -5/8)= 2/2/5

2,8:( 3x- 5,8)= 12/5

3x-5/8         = 2,8:12/5

3x -5/8        = 7/6

3x= 7/6 +5/8

3x= 43/ 24

x= 43/24 :3

x= 43/72

nha bn, mknghix vậy

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

\(\frac{14}{5}:\left(3x-\frac{5}{8}\right)=\frac{12}{5}\)

        \(\left(3x-\frac{5}{8}\right)\)\(=\frac{14}{5}:\frac{12}{5}\)

         \(\left(3x-\frac{5}{8}\right)\)\(=\frac{14}{5}.\frac{5}{12}\)

           \(3x-\frac{5}{8}\)   \(=\frac{7}{6}\)

          \(3x\)              \(=\frac{7}{6}+\frac{5}{8}\)

          \(3x\)               \(=\frac{28}{24}+\frac{15}{24}\)

          \(3x\)               \(=\frac{43}{24}\)

           \(x\)                \(=\frac{43}{24}:3\)

          \(x\)                  \(=\frac{43}{24}.\frac{1}{3}\)

         \(x\)                    \(=\frac{43}{72}\)

Vậy   \(x\)                     \(=\frac{43}{72}\)

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