《章末复习课》函数的概念与性质PPT

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求函数的解析式
(1)函数 f(x)在 R 上为奇函数,当 x>0 时,f(x)= x+1,则
f(x)的解析式为______.
(2)已知 f1+x x=1+x2x2+1x,则 f(x)的解析式为________.
1+ x,x>0
(1)f(x)=0,x=0 - -x-1,x<0
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1.已给出函数解析式:函数的定义域是使解析式有意义的自变量的
取值集合.
2.实际问题:求函数的定义域既要考虑解析式有意义,还应考虑使 实际问题有意义.
6
D [由
1.函数f(x)=
3x2 +(3x-1)0的定义域是( PPT模板:www.1ppt.com/moban/
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2
3
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x2-9≠0,
x≤5,
得x≥1, x≠±3,
故函数的定义域是{x|1≤x≤5且x≠3}.
(2)设矩形的一边长为x,则另一边长为12(a-2x),
所以y=x·12(a-2x)=-x2+12ax,定义域为x0<x<12a
.
5
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第三章 函数的概念与性质
章末复习课
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)
1-x>0, 3x-1≠0,
得 x<1
A.-∞,13 C.-13,13
B.13,1 D.-∞,13∪13,1
且 x≠13,故选 D.]
7
【例 2】
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(2)f(x)=x2-x+1,x∈(-∞,1)∪(1,+∞) 地理课件:www.1ppt.com/kejian/dili/
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求函数的定义域
【例 1】 (1)求函数 y= 5-x+ x-1-x2-1 9的定义域. (2)将长为 a 的铁丝折成矩形,求矩形面积 y 关于一边长 x 的解析式, 并写出此函数的定义域.
4
[解]
5-x≥0,
(1)解不等式组x-1≥0,
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