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一、选择题 (共 2 0个小题 ,每小题 3分 ,共 6 0分 )1 函数 y=2 -x 的定义域是 A {x｜ 0 x2 } B {x｜ 0 x≤ 2 } C {x｜x ≤ 2 } D {x｜x 2 }2 函数 y =2x- 1(x ∈R)的反函数为 A y =2x+1(x∈R) B y=x2 +12 (x∈R) C y=x2 - 1(x∈R) D y =x2 +2 (x ∈R)3 已知复数
First, the multiple-choice questions (a total of 20 small items, each small problem 3 points, a total of 60 points) 1 function y=2 -x domain is A {x | 0 x2} B {x | 0 x ≤ 2 } C {x|x ≤ 2 } D {x|x 2 }2 The inverse function of the function y = 2x- 1(x ∈R) is A y =2x+1(x∈R) B y=x2 +12 (x ∈R) C y=x2 - 1(x∈R) D y =x2 +2 (x ∈R)3 Known complex numbers