Question

[Xin giấu tên]

Nêu tính chất đặc trưng:

A={\(\frac{2}{3},\:\frac{3}{8},\:\frac{4}{15},\:\frac{5}{24},\:\frac{6}{36}\)}

B={\(0,3,8,15,24,35\)}

Answer 1

[Nguyễn Ngọc Lộc]

\(A=\left\{x\in Q|x=\frac{k}{k^2-1},2\le k\le6,k\in Z\right\}\)

\(B=\left\{x\in Z|x=k^2-1,1\le k\le6,k\in Z\right\}\)