Question

a)   24/25- x  =  3/5

b)   4/7 - x/21 = 10/21

Answer 1

a) \(\dfrac{24}{25}-x=\dfrac{3}{5}\)

\(x=\dfrac{24}{25}-\dfrac{3}{5}\)

\(x=\dfrac{24}{25}-\dfrac{15}{25}\)

\(x=\dfrac{9}{25}\)

b) \(\dfrac{4}{7}-\dfrac{x}{21}=\dfrac{10}{21}\)

\(\dfrac{x}{21}=\dfrac{4}{7}-\dfrac{10}{21}\)

\(\dfrac{x}{21}=\dfrac{12}{21}-\dfrac{10}{21}\)

\(\dfrac{x}{21}=\dfrac{2}{21}\)

\(x=2\)

Answer 2

a) 24/25 - x = 3/5

                 x =24/25 - 3/5

                 x = 24/25 - 15/25

                 x = 9/15 

                 x = 3/5

Vậy x = 3/5

b)4/7 - x/21 = 10/21

            x/21 = 4/7 - 10/21

            x/21 = 12/21 - 10/21

            x/21 = 2/21

vậy x = 2

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