Question

[Minh Châu Trần]

Tìm x:

a) x - 1\(\dfrac{3}{5}\)= 2\(\dfrac{1}{10}\)                              b) \(5\dfrac{1}{7}\) : x = \(4\dfrac{1}{2}\)

Answer 1

[Hà Quang Minh]

\(a,x-1\dfrac{3}{5}=2\dfrac{1}{10}\\ x-\dfrac{8}{5}=\dfrac{21}{10}\\ x=\dfrac{21}{10}+\dfrac{8}{5}\\ x=\dfrac{21}{10}+\dfrac{16}{10}\\ x=\dfrac{37}{10}\\ b,5\dfrac{1}{7}:x=4\dfrac{1}{2}\\ \dfrac{36}{7}:x=\dfrac{9}{2}\\ x=\dfrac{36}{7}:\dfrac{9}{2}\\ x=\dfrac{36}{7}\cdot\dfrac{2}{9}\\ x=\dfrac{8}{7}\)