Question

[Nguyễn Thị Ngọc Diệu]

tìm x

b,x x2/3=4/9x3/8

a,4/5-x=7/4:21/8

Answer 1

[456]

b) x x 2/3 = 4/9 x 3/8

    x x 2/3 = 1/4

    x          = 1/4 : 2/3 (1/4 x 3/2)

    x          = 3/2

a)  4/5 - x = 7/4 : 21/8 (7/4 x 8/21)

     4/5 - x = 2/3

             x = 4/5 - 2/3 (12/15 - 10/15 )

             x = 2/15

Answer 2

[Trần Nguyễn Phương Thảo]

a)

\(\dfrac{4}{5}-x=\dfrac{7}{4}:\dfrac{21}{8} \)

\(\dfrac{4}{5}-x=\dfrac{7}{4}.\dfrac{8}{21}\)

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

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

\(x=\dfrac{10}{15}+\dfrac{12}{15}\)

\(x=\dfrac{22}{15}\)

b)

\(x.\dfrac{2}{3}=\dfrac{4}{9}.\dfrac{3}{8}\)

\(x.\dfrac{2}{3}=\dfrac{1}{6}\)

\(x=\dfrac{1}{6}:\dfrac{2}{3}\)

\(x=\dfrac{1}{6}.\dfrac{3}{2}\)

\(x=\dfrac{1}{2}.\dfrac{1}{2}\)

\(x=\dfrac{1}{4}\)