a ) 

\(x+\frac{12}{15}=\frac{7}{5}\)

\(\Rightarrow x=\frac{7}{5}-\frac{12}{15}\)

\(\Rightarrow x=\frac{7}{5}-\frac{4}{5}\)

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

Vậy \(x=\frac{3}{5}\)

b ) 

\(x-\frac{6}{8}=\frac{3}{15}\)

\(\Rightarrow x-\frac{3}{4}=\frac{1}{5}\)

\(\Rightarrow x=\frac{1}{5}+\frac{3}{4}\)

\(\Rightarrow x=\frac{4}{20}+\frac{15}{20}\)

\(\Rightarrow x=\frac{19}{20}\)

Vậy \(x=\frac{19}{20}\)

~ Ủng hộ nhé 

\(x+\frac{12}{15}=\frac{7}{5}\)

\(\Rightarrow x=\frac{7}{5}-\frac{12}{15}\)

\(\Rightarrow x=\frac{7}{5}-\frac{4}{5}\)

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

c ) 

\(x:\frac{17}{25}=\frac{15}{34}\)

\(\Rightarrow x=\frac{15}{34}\times\frac{17}{25}\)

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

Vậy \(x=\frac{3}{10}\)

d ) 

\(\frac{1}{5}\times x=\frac{9}{45}\)

\(\Rightarrow x=\frac{9}{45}:\frac{1}{5}\)

\(\Rightarrow x=\frac{9}{45}\times5\)

\(\Rightarrow x=\frac{9}{5}\)

Vậy \(x=\frac{9}{5}\)

~ Ủng hộ nhé 

a) x + 12/15 = 7/5

=> x = 7/5 - 12/15

=> x = 3/5

b) x - 6/8 = 3/15

=> x = 3/15 + 6/8

=> x = 19/20

c) x : 17/25 = 15/34

=> x = 15/34 x 17/25

=> x = 3/10

d) 1/5 x X = 9/45

=> x = 9/45 : 1/5

=> x = 1

a) \(x+\frac{12}{15}=\frac{7}{5}\)

\(x+\frac{4}{5}=\frac{7}{5}\)

\(x=\frac{7}{5}-\frac{4}{5}\)

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

b) \(x-\frac{6}{8}=\frac{3}{15}\)

\(x-\frac{3}{4}=\frac{1}{5}\)

\(x=\frac{1}{5}+\frac{3}{4}\)

\(x=\frac{19}{20}\)

c) \(x:\frac{17}{25}=\frac{15}{34}\)

\(x=\frac{15}{34}\times\frac{17}{25}\)

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

d) \(\frac{1}{5}\times x=\frac{9}{45}\)

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

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

x=1

a) x + 12/15 = 7/5

               x   = 7/5 - 12/15

               x   = 3/5

b) x - 6/8 = 3/15

           x  = 3/15 + 6/8

           x  = 19/20

c) x : 17/25 = 15/34

            x    = 15/34 x 17/25

            x    = 3/10

d) 1/5 nhân x = 9/45

                x   = 9/45 : 1/5

                 x  = 1

\(x+\frac{12}{15}=\frac{7}{5}\)

\(x+\frac{4}{5}=\frac{7}{5}\)

\(x=\frac{7}{5}-\frac{4}{5}\)

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