1) ∀ a ∈ R, a² ≥ 0
2) ∀ b ∈ R, ∃ a ∈ R, c ∈ R, что a < b < c
3) ∃ a ∈ R, ∀ b ∈ R, a * b = a
4) ∀ a, b ∈ R a² + b² = 0 ⇔ a = 0; b = 0
5) ∀ a, b ∈ R a + b > 0 => a > 0 ∨ b > 0
1) n² > 0
2) (n-1) < X < (n+1)
3) X*n = X и Х=1
4) a² + b² = 0, a, b = 0.
5) a+b > 0, a > -b
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1) ∀ a ∈ R, a² ≥ 0
2) ∀ b ∈ R, ∃ a ∈ R, c ∈ R, что a < b < c
3) ∃ a ∈ R, ∀ b ∈ R, a * b = a
4) ∀ a, b ∈ R a² + b² = 0 ⇔ a = 0; b = 0
5) ∀ a, b ∈ R a + b > 0 => a > 0 ∨ b > 0
1) n² > 0
2) (n-1) < X < (n+1)
3) X*n = X и Х=1
4) a² + b² = 0, a, b = 0.
5) a+b > 0, a > -b