Question

Answer 1

\(A=\left\{-\dfrac{3}{2};-\dfrac{2}{3};-\dfrac{1}{4};0;\dfrac{1}{6};\dfrac{2}{7};\dfrac{3}{8}\right\}\)

\(B=\left\{\left(0;3\right),\left(0;2\right),\left(0;1\right),\left(0;0\right),\left(1;2\right),\left(1;1\right),\left(1;0\right),\left(2;1\right),\left(2;0\right),\left(3;0\right)\right\}\)

Như này nhỉ?

Answer 2

a) Các phần tử của A là:

\(\dfrac{0}{0+5}=0\)
\(\dfrac{1}{1+5}=\dfrac{1}{6}\)

\(\dfrac{2}{2+5}=\dfrac{2}{7}\)

\(\dfrac{3}{3+5}=\dfrac{3}{8}\)

\(\Rightarrow A=\left\{0;\dfrac{1}{6};\dfrac{2}{7};\dfrac{3}{8}\right\}\)