Question

[Nguyễn thị cúc]

Tìm x biết 

A. 1/5:x=2/3

B. 3/8*x=5/7

Answer 1

[No Name]

A. 1/5 : x = 2/3

             x = 1/5 : 2/3

             x = 1/5 * 3/2

             x = 3/10

B. 3/8 * x = 5/7

             x = 5/7 : 3/8

             x = 5/7 * 8/3

             x = 40/21

Answer 2

[%$H*&]

a)\(\frac{1}{5}:x=\frac{2}{3}\)

\(x=\frac{2}{3}\times\frac{1}{5}\)

\(x=\frac{2}{15}\)

b)\(\frac{3}{8}\times x=\frac{5}{7}\)

\(x=\frac{5}{7}\times\frac{8}{3}\)

\(x=\frac{40}{21}\)