Question

Se considera mulțimile :A={-1,2,-3}si B={-2,5}.SCRIETI ELEMENTELE MULȚIMII. C={x=a supra b | a€ A și b€ B}

Answer 1

$A = \{-1;\,2;\,-3\}\\ B = \{-2;\,5\}\\ \\ C = \left\{x =\dfrac{a}{b}\,\Big|\,a \in A\,\wedge \,b\in B\right\}\\ \\ =\left\{ \dfrac{-1}{-2};\, \dfrac{-1}{5};\, \dfrac{2}{-2};\, \dfrac{2}{5};\, \dfrac{-3}{-2};\, \dfrac{-3}{5}\right\}\\ \\ =\left\{ \dfrac{1}{2};\, -\dfrac{1}{5};\, -1;\, \dfrac{2}{5};\, \dfrac{3}{2};\,-\dfrac{3}{5}\right\}$