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求函数的值域

求函数的值域. 基础练习. 1. 已知函数 f(x)=2x － 3, x∈{0,1,. 2,3,5}, 则 f(x) 的值域是 :. { － 3, － 1, 1, 3, 7}. 2. 函数 y=x 2 +4x+6 的值域是 :. [ 2, +∞). 例题讲解. 1. 求下列函数的值域 :. ① y=4x － 5, x∈( － 1, 2]. ② y= － x 2 － 2x+3, x∈[ － 5, 0]. ③ y=. 2. 求下列函数的值域 :. ① y= (x≠3). ② y=. 课堂小结.

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求函数的值域

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  1. 求函数的值域

  2. 基础练习 1. 已知函数f(x)=2x－3, x∈{0,1, 2,3,5}, 则f(x)的值域是: {－3, －1, 1, 3, 7} 2. 函数y=x2+4x+6 的值域是: [ 2, +∞)

  3. 例题讲解 1. 求下列函数的值域: ① y=4x－5, x∈(－1, 2] ② y=－x2－2x+3, x∈[－5, 0] ③ y=

  4. 2. 求下列函数的值域: ① y= (x≠3) ② y=

  5. 课堂小结 求函数的值域的方法： (1) 观察法; (2) 图象法; (3) 分式分离常数法; (4) 解x法; (5) 配方法; (6) 函数单调性法； (7) 分段函数法.

  6. 作业 求下列函数的定义域和值域: (1) y= (2) y= (3) y= x2－4x+5, x∈[0, 5] (4) y= Good bye ! (5) y=

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