Question

[Kim Tuyền Diệp]

Tìm X biết 

a) \(x\cdot\frac{2}{7}\cdot\frac{3}{4}=\frac{5}{21}\)

b) \(x\cdot\frac{1}{2}=\frac{1}{3}\)

c) \(x:\frac{4}{5}=\frac{25}{8}:\frac{5}{4}\)

Answer 1

[Tiến Vỹ]

a,

x.2/7.3/4=5/21

x.3/14=5/21

x=5/21:3/14

x=10/9

b, 

x.1/2=1/3

x=1/3:1/2

x=2/3

c,

x:4/5=25/8:5/4

x:4/5=5/2

x=5/2.4/5=2

Answer 2

[không có tên]

A, x= 5/25 : 3/4 : 2/7 = 14/15

B, x=1/3 : 1/2 = 2/3

C, x=(25/8 : 5/4)x4/5 = 5/2 x 4/5 = 2