Question

Tìm \(x\) biết :

a) \(\dfrac{5}{4}.x=\dfrac{4}{7}\)

b) \(\dfrac{3}{4}:x=\dfrac{1}{2}\)

Answer 1

a) Từ suy ra x = ;

b) Từ suy ra x = .

Answer 2

\(a.\dfrac{5}{4}.x=\dfrac{4}{7}\)

\(\Rightarrow x=\dfrac{4}{7}:\dfrac{5}{4}\)

\(\Rightarrow x=\dfrac{4}{7}.\dfrac{4}{5}\)

\(\Rightarrow x=\dfrac{16}{35}\)

\(b.\dfrac{3}{4}:x=\dfrac{1}{2}\)

\(\Rightarrow x=\dfrac{3}{4}:\dfrac{1}{2}\)

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

\(\Rightarrow x=\dfrac{6}{4}\)

Answer 3

a.\(\dfrac{5}{4}.x=\dfrac{4}{7}\)

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

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

\(x=\dfrac{4.4}{7.5}\)

\(x=\dfrac{16}{35}\)

Vậy : \(x=\dfrac{16}{35}\)

b.\(\dfrac{3}{4}:x=\dfrac{1}{2}\)

\(x=\dfrac{3}{4}:\dfrac{1}{2}\)

\(x=\dfrac{3}{4}.\dfrac{2}{1}\)

\(x=\dfrac{3.2}{2.2.1}\)

\(x=\dfrac{3}{2}\)

Vậy : \(x=\dfrac{3}{2}\)

Answer 4

Answer 5

a=35/46

b=3/8

Answer 6

a) 5/4 . x = 4/7

x = 4/7 : 5/4

x = 4/7 . 4/5

x = 16/35

b) 3/4 : x = 1/2

x = 3/4 : 1/2

x = 6/4

x = 3/2

Answer 7