Question

Giúp mk thêm 2 câu này nx ạ . a) 3/5 x - 1/2 = 1/7 b) 3/5 x + 2/7 = 4/5

Answer 1

`a) 3 / 5 x - 1 / 2 = 1 / 7`

`3 / 5 x = 1 / 7 + 1 / 2`

`3 / 5 x = 9 / 14`

`x = 9 / 14 : 3 / 5`

`x = 15 / 14`

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`b) 3 / 5 x + 2 / 7 = 4 / 5`

`3 / 5 x = 4 / 5 - 2 / 7`

`3 / 5 x = 18 / 35`

`x = 18 / 35 : 3 / 5`

`x = 6 / 7`

Answer 2

a) 3/5 x - 1/2 = 1/7

 3/5 x = 1/7 + 1/2 

 3/5 x = 9/14

x = 9/14 : 3/5

x = 15/14

 

b) 3/5 x + 2/7 = 4/5

3/5x = 4/5 - 2/7

3/5x = 18/35

x = 18/35: 3/5

x = 6/7

Answer 3

\(a.\dfrac{3}{5}x-\dfrac{1}{2}=\dfrac{1}{7}\\ \dfrac{3}{5}x=\dfrac{1}{7}+\dfrac{1}{2}\\ \dfrac{3}{5}x=\dfrac{9}{14}\\ x=\dfrac{9}{14}:\dfrac{3}{5}\\ x=\dfrac{15}{14}\\ --------\\ b.\dfrac{3}{5}x+\dfrac{2}{7}=\dfrac{4}{5}\\ \dfrac{3}{5}x=\dfrac{4}{5}-\dfrac{2}{7}\\ \dfrac{3}{5}x=\dfrac{18}{35}\\ x=\dfrac{18}{35}:\dfrac{3}{5}\\ x=\dfrac{6}{7}\)

Answer 4

\(a)\dfrac{3}{5}x-\dfrac{1}{2}=\dfrac{1}{7}\)

\(\dfrac{3}{5}x\)         \(=\dfrac{1}{7}+\dfrac{1}{2}=\dfrac{9}{14}\)

   \(x\)         \(=\dfrac{9}{14}:\dfrac{3}{5}=\dfrac{15}{14}\)

\(b)\dfrac{3}{5}x+\dfrac{2}{7}=\dfrac{4}{5}\)

   \(\dfrac{3}{5}x\)         \(=\dfrac{4}{5}-\dfrac{2}{7}=\dfrac{18}{35}\)

      \(x\)         \(=\dfrac{18}{35}:\dfrac{3}{5}=\dfrac{6}{7}\)