Question

Tìm \(\frac{a}{b}\)biết \(\frac{5}{9}\)x \(\frac{a}{b}\)- \(\frac{11}{21}\)= \(\frac{4}{21}\)

Answer 1

\(\frac{5}{9}\) . \(\frac{a}{b}\) - \(\frac{11}{21}\) = \(\frac{4}{21}\)  

\(\frac{5}{9}\) . \(\frac{a}{b}\)               = \(\frac{4}{21}\) + \(\frac{11}{21}\)

\(\frac{5}{9}\) . \(\frac{a}{b}\)               = \(\frac{5}{7}\) 

            \(\frac{a}{b}\)               = \(\frac{5}{7}\) : \(\frac{5}{9}\) 

              \(\frac{a}{b}\)             = \(\frac{9}{7}\) 

Vậy \(\frac{a}{b}\) = \(\frac{9}{7}\) 

Answer 2

5/9 x a/b-11/21=4/21

<=> 5/9 x a/b=4/21+11/21

<=> 5/9 x a/b = 21/21=1

<=> a/b = 1 : 5/9

<=> a/b=9/5

Vậy a/b=9/5

Answer 3

Ta có : 

\(\frac{5}{9}\times\frac{a}{b}-\frac{11}{21}=\frac{4}{21}\)

\(\Rightarrow\frac{5}{9}\times\frac{a}{b}=\frac{4}{21}+\frac{11}{21}\)

\(\Rightarrow\frac{5}{9}\times\frac{a}{b}=\frac{15}{21}\)

\(\Rightarrow\frac{a}{b}=\frac{15}{21}:\frac{5}{9}\)

\(\Rightarrow\frac{a}{b}=\frac{15}{21}\times\frac{9}{5}\)

\(\Rightarrow\frac{a}{b}=\frac{9}{7}\)

Vậy \(\frac{a}{b}=\frac{9}{7}\)

~ Ủng hộ nhé 

Answer 4

\(\frac{5}{9}×\frac{a}{b}-\frac{11}{21}=\frac{4}{21}\)

\(\frac{5}{9}×\frac{a}{b}=\frac{4}{21}+\frac{11}{21}\)

\(\frac{5}{9}×\frac{a}{b}=\frac{5}{7}\)

\(\frac{a}{b}=\frac{5}{7}:\frac{5}{9}\)

\(\frac{a}{b}=\frac{9}{7}\)

Ủng hộ cho tôi với

Answer 5

5/9*a/b=4/21+11/21

5/9*a/b=15/21

a/b=15/21:5/9

a/b=9/7

Answer 6

Xin lỗi nhé,mình tính sai rồi

Answer 7

5/9 x a/b - 11/21 = 4/21

5/9 x a/b            = 5/7        

a/b                    = 7/9

Answer 8

a/b=9/7

Answer 9

mk nhầm