Questão 3206776

\(\exists x \epsilon \mathbb{R,\exists }y \epsilon \mathbb{N^{*}}\) , tal que \(x\cdot y = 1.\)

∀x \(\epsilon \mathbb{N}, x^{2} + 1 = 26.\)

∀x \(\epsilon \mathbb{N}, \exists y \epsilon \mathbb{R}\) , tal que \(x + y = 15.\)

∀x \(\epsilon \mathbb{R}, \exists y \epsilon \mathbb{N}\) , tal que \(x + y = 20.\)