Trắc nghiệm: a,A,a),À,Á,a;.....;....., a,A=,a°,-a ., a,*a,;a,ạ,A ∩ ∅,A ∪ ∅,A =,A = ?,A),√a,A',A\В,.A,a̟,ậ,(A,Ậ,?.a,Ă,(A),(a)  ,A%,% A,(a),A.,(a)  ,A “………………”,A = [],A = [],A=[],A : ......................................?,a . ....,.... . .... . a,a)...,A +,a.,â,A. ………………………………….,- A! ...,a) .......................................................................,- A ! ...,a) :...........,a = …………….,a = ...............,a=......,a=.......,a=........,a=..........,a=...........,A=......,à,A.←,A. $,a);,a) ;,A. -∞.,a ),A. ;,(a): ……………..,a) ………………………………..,a) ……………..,A = …………………..;,a) .,a......................................,A. .,A. (α) ^ (β).,a) ………………………………………………………………………,A. = :,A., A., A., a), ă, a) ∅ ⊂ ℕ ;, a = ….., /aɪ/, A. ., Â, A. [ ] → ( ) → { }., a) ……………………………………………………………………, a) …………………………………………………………………………………………, a) …………………………………………………………………………, a) ……………………………………………………………………….., \(a\), a. …………………………………………………………………………………….., a) ………………, a) ………………………………, a) ……………………………………….., a) …………………………., A. +∞., A. ℝ;, A \ ∅ = ...;, ∅ \ A = ...., A. (–∞; +∞)., A. ∅., A. ℝ., A. #., a. ………………………………………., a: .................................................................................................................................., a. ………………………………, A. (α) ⊥ (β)., a. ………………………….., à ………………………………………………………………………………….., A₂, A₄, “a”, ∠A₄, a……….., à ………………………………………………………………………………………, à………………………………………………………………………………………., à ……………………………………………………………………………………., à ……………………………………………………………………………………, à ...……………………………………………………………………………………., (a, (a) ®