\(\dfrac{1}{4}\)+\(\dfrac{2}{5}\)+\(\dfrac{1}{3}\)=\(\dfrac{15}{60}\)+\(\dfrac{24}{60}\)+\(\dfrac{20}{60}\)=\(\dfrac{59}{60}\)

in nha bạn

phân số bằng phân số $5/4$ là $25/20$ và $10/8$

$25/20=(25:5)/(20:5)=5/4$

$10/8=(10:2)/(8:2)=5/4$

tên Trang

ta có n-1 ⋮ n-1
⇒3(n-1)⋮ n-1
⇒3n-3⋮ n-1
⇒(3n+2)-(3n-3)⋮ n-1
⇒5⋮ n-1
⇒(n-1)ϵ Ư(5)

vậy n={2;6;0;-4}